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What type of code (server or client) is found in a Code-Behind class?
Answer : The answer is server-side code since code-behind is executed on the server. However, during the code-behind's execution on the server, it can render client-side code such as JavaScript to be processed in the clients browser. But just to be clear, code-behind executes on the server, thus making it server-side code.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
Should user input data validation occur server-side or client-side? Why?
Answer : All user input data validation should occur on the server at a minimum. Additionally, client-side validation can be performed where deemed appropriate and feasible to provide a richer, more responsive experience for the user.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
What is the difference between Server. Transfer and Response. Redirect? Why would I choose one over the other?
Answer : Server. Transfer transfers page processing from one page directly to the next page without making a round-trip back to the client's browser. This provides a faster response with a little less overhead on the server. Server. Transfer does not update the clients url history list or current url. Response. Redirect is used to redirect the user's browser to another page or site. This performs a trip back to the client where the client's browser is redirected to the new page. The user's browser history list is updated to reflect the new address.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
Can you explain the difference between an ADO. NET Dataset and an ADO Record set?
Answer : Valid answers are: • A Dataset can represent an entire relational database in memory, complete with tables, relations, and views. • A Dataset is designed to work without any continuing connection to the original data source. • Data in a Dataset is bulk-loaded, rather than being loaded on demand. • There's no concept of cursor types in a Dataset. • Datasets have no current record pointer You can use For Each loops to move through the data. • You can store many edits in a Dataset, and write them to the original data source in a single operation. • Though the Dataset is universal, other objects in ADO. NET come in different versions for different data sources.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
What is the Global.asax used for?
Answer : The Global.asax (including the Global.asax.cs file) is used to implement application and session level events.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
What are the Application_Start and Session_Start subroutines used for?
Answer : This is where you can set the specific variables for the Application and Session objects.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
Can you explain what inheritance is and an example of when you might use it?
Answer : When you want to inherit (use the functionality of) another class. Example: With a base class named Employee, a Manager class could be derived from the Employee base class.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
Whats an assembly?
Answer : Assemblies are the building blocks of the .NET framework. Overview of assemblies from MSDN
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
Describe the difference between inline and code behind.
Answer : Inline code written along side the html in a page. Code-behind is code written in a separate file and referenced by the .aspx page.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
Explain what a diffgram is, and a good use for one?
Answer : The DiffGram is one of the two XML formats that you can use to render DataSet object contents to XML. A good use is reading database data to an XML file to be sent to a Web Service.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
Whats MSIL, and why should my developers need an appreciation of it if at all?
Answer : MSIL is the Microsoft Intermediate Language. All .NET compatible languages will get converted to MSIL. MSIL also allows the .NET Framework to JIT compile the assembly on the installed computer.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
Can you edit data in the Repeater control?
Answer : No, it just reads the information from its data source.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
How can you provide an alternating color scheme in a Repeater control?
Answer : Use the AlternatingItemTemplate.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
What base class do all Web Forms inherit from?
Answer : The Page class.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
Name two properties common in every validation control?
Answer : ControlToValidate property and Text property.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
How many classes can a single .NET DLL contain?
Answer : It can contain many classes.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
What does WSDL stand for?
Answer : Web Services Description Language
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
Where on the Internet would you look for Web services?
Answer : http://www.uddi.org
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
True or False: To test a Web service you must create a windows application or Web application to consume this service?
Answer : False, the web service comes with a test page and it provides HTTP-GET method to test.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
How many classes can a single .NET DLL contain?
Answer : It can contain many classes.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
What is the difference between an EXE and a DLL?
Answer : You cancreate an objects of Dll but not of the EXE. Dll is an In-Process Component whereas EXE is an OUt-Process Component. Exe is for single use whereas you can use Dll for multiple use. Exe can be started as standalone where dll cannot be.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
What is strong-typing versus weak-typing?Which is preferred? Why?
Answer : Strong typing implies that the types of variables involved in operations are associated to the variable, checked at compile-time, and require explicit conversion; weak typing implies that they are associated to the value, checked at run-time, and are implicitly converted as required. (Which is preferred is a disputable point, but I personally prefer strong typing because I like my errors to be found as soon as possible.)
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
What is a PID? How is it useful when troubleshooting a system?
Answer : PID is the process Id of the application in Windows. Whenever a process starts running in the Windows environment, it is associated with an individual process Id or PID.The PID (Process ID) a unique number for each item on the Process Tab, Image Name list. How do you get the PID to appear? In Task Manger, select the View menu, then select columns and check PID (Process Identifier). In Linux, PID is used to debug a process explicitly. However we cannot do this in a windows environment. Microsoft has launched a SDK called as Microsoft Operations Management (MOM). This uses the PID to find out which dll™s have been loaded by a process in the memory. This is essentially helpful in situations where the Process which has a memory leak is to be traced to a erring dll. Personally I have never used a PID, our Windows debugger does the things required to find out.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
What is the CLR?
Answer : CLR = Common Language Runtime. The CLR is a set of standard resources that (in theory) any .NET program can take advantage of, regardless of programming language. Robert Schmidt (Microsoft) lists the folloswing CLR resources in his MSDN PDC# article: Object-oriented programming model (inheritance, polymorphism, exception handling, garbage collection) Security model Type system All .NET base classes Many .NET framework classes Development, debugging, and profiling tools Execution and code management IL-to-native translators and optimizers What this means is that in the .NET world, different programming languages will be more equal in capability than they have ever been before, although clearly not all languages will support all CLR services.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
What is the CTS?
Answer : CTS = Common Type System. This is the range of types that the .NET runtime understands, and therefore that .NET applications can use. However note that not all .NET languages will support all the types in the CTS. The CTS is a superset of the CLS. .
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
What is the CLS?
Answer : CLS = Common Language Specification. This is a subset of the CTS which all .NET languages are expected to support. The idea is that any program which uses CLS-compliant types can interoperate with any .NET program written in any language. In theory this allows very tight interop between different .NET languages - for example allowing a C# class to inherit from a VB class.  
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
What is IL?
Answer : IL = Intermediate Language. Also known as MSIL (Microsoft Intermediate Language) or CIL (Common Intermediate Language). All .NET source code (of any language) is compiled to IL. The IL is then converted to machine code at the point where the software is installed, or at run-time by a Just-In-Time (JIT) compiler. 
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
What does 'managed' mean in the .NET context?>
Answer : The term 'managed' is the cause of much confusion. It is used in various places within .NET, meaning slightly different things.Managed code: The .NET framework provides several core run-time services to the programs that run within it - for example exception handling and security. For these services to work, the code must provide a minimum level of information to the runtime. Such code is called managed code. All C# and Visual Basic.NET code is managed by default. VS7 C++ code is not managed by default, but the compiler can produce managed code by specifying a command-line switch (/com+). Managed data: This is data that is allocated and de-allocated by the .NET runtime's garbage collector. C# and VB.NET data is always managed. VS7 C++ data is unmanaged by default, even when using the /com+ switch, but it can be marked as managed using the __gc keyword.Managed classes: This is usually referred to in the context of Managed Extensions (ME) for C++. When using ME C++, a class can be marked with the __gc keyword. As the name suggests, this means that the memory for instances of the class is managed by the garbage collector, but it also means more than that. The class becomes a fully paid-up member of the .NET community with the benefits and restrictions that brings. An example of a benefit is proper interop with classes written in other languages - for example, a managed C++ class can inherit from a VB class. An example of a restriction is that a managed class can only inherit from one base class.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
What is reflection?
Answer : All .NET compilers produce metadata about the types defined in the modules they produce. This metadata is packaged along with the module (modules in turn are packaged together in assemblies), and can be accessed by a mechanism called reflection. The System.Reflection namespace contains classes that can be used to interrogate the types for a module/assembly. Using reflection to access .NET metadata is very similar to using ITypeLib/ITypeInfo to access type library data in COM, and it is used for similar purposes - e.g. determining data type sizes for marshaling data across context/process/machine boundaries. Reflection can also be used to dynamically invoke methods (see System.Type.InvokeMember ) , or even create types dynamically at run-time (see System.Reflection.Emit.TypeBuilder).  
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
What is the difference between Finalize and Dispose (Garbage collection) ?
Answer : Class instances often encapsulate control over resources that are not managed by the runtime, such as window handles (HWND), database connections, and so on. Therefore, you should provide both an explicit and an implicit way to free those resources. Provide implicit control by implementing the protected Finalize Method on an object (destructor syntax in C# and the Managed Extensions for C++). The garbage collector calls this method at some point after there are no longer any valid references to the object. In some cases, you might want to provide programmers using an object with the ability to explicitly release these external resources before the garbage collector frees the object. If an external resource is scarce or expensive, better performance can be achieved if the programmer explicitly releases resources when they are no longer being used. To provide explicit control, implement the Dispose method provided by the IDisposable Interface. The consumer of the object should call this method when it is done using the object. Dispose can be called even if other references to the object are alive. Note that even when you provide explicit control by way of Dispose, you should provide implicit cleanup using the Finalize method. Finalize provides a backup to prevent resources from permanently leaking if the programmer fails to call Dispose. . 
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
What is Partial Assembly References?
Answer : Full Assembly reference: A full assembly reference includes the assembly's text name, version, culture, and public key token (if the assembly has a strong name). A full assembly reference is required if you reference any assembly that is part of the common language runtime or any assembly located in the global assembly cache. Partial Assembly reference: We can dynamically reference an assembly by providing only partial information, such as specifying only the assembly name. When you specify a partial assembly reference, the runtime looks for the assembly only in the application directory. We can make partial references to an assembly in your code one of the following ways: -> Use a method such as System.Reflection.Assembly.Load and specify only a partial reference. The runtime checks for the assembly in the application directory. -> Use the System.Reflection.Assembly.LoadWithPartialName method and specify only a partial reference. The runtime checks for the assembly in the application directory and in the global assembly cache.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
Changes to which portion of version number indicates an incompatible change?
Answer : Major or minor. Changes to the major or minor portion of the version number indicate an incompatible change. Under this convention then, version 2.0.0.0 would be considered incompatible with version 1.0.0.0. Examples of an incompatible change would be a change to the types of some method parameters or the removal of a type or method altogether. Build. The Build number is typically used to distinguish between daily builds or smaller compatible releases. Revision. Changes to the revision number are typically reserved for an incremental build needed to fix a particular bug. You'll sometimes hear this referred to as the "emergency bug fix" number in that the revision is what is often changed when a fix to a specific bug is shipped to a customer.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
What is side-by-side execution? Can two application one using private assembly and other using Shared assembly be stated as a side-by-side executables?
Answer :  Side-by-side execution is the ability to run multiple versions of an application or component on the same computer. You can have multiple versions of the common language runtime, and multiple versions of applications and components that use a version of the runtime, on the same computer at the same time. Since versioning is only applied to shared assemblies, and not to private assemblies, two application one using private assembly and one using shared assembly cannot be stated as side-by-side executables.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
Why string are called Immutable data Type ?
Answer : The memory representation of string is an Array of Characters, So on re-assigning the new array of Char is formed & the start address is changed . Thus keeping the Old string in Memory for Garbage Collector to be disposed.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
What does assert() method do?
Answer : In debug compilation, assert takes in a Boolean condition as a parameter, and shows the error dialog if the condition is false. The program proceeds without any interruption if the condition is true.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
What's the difference between the Debug class and Trace class?
Answer : Documentation looks the same. Use Debug class for debug builds, use Trace class for both debug and release builds.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
Why are there five tracing levels in System.Diagnostics.TraceSwitcher?
Answer : The tracing dumps can be quite verbose. For applications that are constantly running you run the risk of overloading the machine and the hard drive. Five levels range from None to Verbose, allowing you to fine-tune the tracing activities.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
Where is the output of TextWriterTraceListener redirected?
Answer : To the Console or a text file depending on the parameter passed to the constructor.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
How do assemblies find each other?
Answer : By searching directory paths. There are several factors which can affect the path (such as the AppDomain host, and application configuration files), but for private assemblies the search path is normally the application's directory and its sub-directories. For shared assemblies, the search path is normally same as the private assembly path plus the shared assembly cache.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
How does assembly versioning work?
Answer : Each assembly has a version number called the compatibility version. Also each reference to an assembly (from another assembly) includes both the name and version of the referenced assembly.The version number has four numeric parts (e.g. 5.5.2.33). Assemblies with either of the first two parts different are normally viewed as incompatible. If the first two parts are the same, but the third is different, the assemblies are deemed as 'maybe compatible'. If only the fourth part is different, the assemblies are deemed compatible. However, this is just the default guideline - it is the version policy that decides to what extent these rules are enforced. The version policy can be specified via the application configuration file.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
What is garbage collection?
Answer : Garbage collection is a system whereby a run-time component takes responsibility for managing the lifetime of objects and the heap memory that they occupy. This concept is not new to .NET - Java and many other languages/runtimes have used garbage collection for some time.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
Why doesn't the .NET runtime offer deterministic destruction?
Answer : Because of the garbage collection algorithm. The .NET garbage collector works by periodically running through a list of all the objects that are currently being referenced by an application. All the objects that it doesn't find during this search are ready to be destroyed and the memory reclaimed. The implication of this algorithm is that the runtime doesn't get notified immediately when the final reference on an object goes away - it only finds out during the next sweep of the heap. Futhermore, this type of algorithm works best by performing the garbage collection sweep as rarely as possible. Normally heap exhaustion is the trigger for a collection sweep.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
Is the lack of deterministic destruction in .NET a problem?
Answer : It's certainly an issue that affects component design. If you have objects that maintain expensive or scarce resources (e.g. database locks), you need to provide some way for the client to tell the object to release the resource when it is done. Microsoft recommend that you provide a method called Dispose() for this purpose. However, this causes problems for distributed objects - in a distributed system who calls the Dispose() method? Some form of reference-counting or ownership-management mechanism is needed to handle distributed objects - unfortunately the runtime offers no help with this.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
What is serialization?
Answer : Serialization is the process of converting an object into a stream of bytes. Deserialization is the opposite process of creating an object from a stream of bytes. Serialization / Deserialization is mostly used to transport objects (e.g. during remoting), or to persist objects (e.g. to a file or database).
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
Does the .NET Framework have in-built support for serialization?
Answer : There are two separate mechanisms provided by the .NET class library - XmlSerializer and SoapFormatter/BinaryFormatter. Microsoft uses XmlSerializer for Web Services, and uses SoapFormatter/BinaryFormatter for remoting. Both are available for use in your own code.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
Can I customise the serialization process?
Answer : Yes. XmlSerializer supports a range of attributes that can be used to configure serialization for a particular class. For example, a field or property can be marked with the [XmlIgnore] attribute to exclude it from serialization. Another example is the [XmlElement] attribute, which can be used to specify the XML element name to be used for a particular property or field. Serialization via SoapFormatter/BinaryFormatter can also be controlled to some extent by attributes. For example, the [NonSerialized] attribute is the equivalent of XmlSerializer's [XmlIgnore] attribute. Ultimate control of the serialization process can be acheived by implementing the the ISerializable interface on the class whose instances are to be serialized.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
Why is XmlSerializer so slow?
Answer : There is a once-per-process-per-type overhead with XmlSerializer. So the first time you serialize or deserialize an object of a given type in an application, there is a significant delay. This normally doesn't matter, but it may mean, for example, that XmlSerializer is a poor choice for loading configuration settings during startup of a GUI application.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
Why do I get errors when I try to serialize a Hashtable?
Answer : XmlSerializer will refuse to serialize instances of any class that implements IDictionary, e.g. Hashtable. SoapFormatter and BinaryFormatter do not have this restriction.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
What are attributes?
Answer : There are at least two types of .NET attribute. The first type I will refer to as a metadata attribute - it allows some data to be attached to a class or method. This data becomes part of the metadata for the class, and (like other class metadata) can be accessed via reflection.The other type of attribute is a context attribute. Context attributes use a similar syntax to metadata attributes but they are fundamentally different. Context attributes provide an interception mechanism whereby instance activation and method calls can be pre- and/or post-processed.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
How does CAS work?
Answer : The CAS security policy revolves around two key concepts - code groups and permissions. Each .NET assembly is a member of a particular code group, and each code group is granted the permissions specified in a named permission set. For example, using the default security policy, a control downloaded from a web site belongs to the 'Zone - Internet' code group, which adheres to the permissions defined by the 'Internet' named permission set. (Naturally the 'Internet' named permission set represents a very restrictive range of permissions.)
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
I can't be bothered with all this CAS stuff. Can I turn it off?
Answer : Yes, as long as you are an administrator. Just run: caspol -s off
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
35. Can I look at the IL for an assembly?
Answer : Yes. MS supply a tool called Ildasm which can be used to view the metadata and IL for an assembly.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
Can source code be reverse-engineered from IL?
Answer : Yes, it is often relatively straightforward to regenerate high-level source (e.g. C#) from IL.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
How can I stop my code being reverse-engineered from IL?
Answer : There is currently no simple way to stop code being reverse-engineered from IL. In future it is likely that IL obfuscation tools will become available, either from MS or from third parties. These tools work by 'optimising' the IL in such a way that reverse-engineering becomes much more difficult. Of course if you are writing web services then reverse-engineering is not a problem as clients do not have access to your IL.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
Is there built-in support for tracing/logging?
Answer : Yes, in the System.Diagnostics namespace. There are two main classes that deal with tracing - Debug and Trace. They both work in a similar way - the difference is that tracing from the Debug class only works in builds that have the DEBUG symbol defined, whereas tracing from the Trace class only works in builds that have the TRACE symbol defined. Typically this means that you should use System.Diagnostics.Trace.WriteLine for tracing that you want to work in debug and release builds, and System.Diagnostics.Debug.WriteLine for tracing that you want to work only in debug builds.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
Can I redirect tracing to a file?
Answer : Yes. The Debug and Trace classes both have a Listeners property, which is a collection of sinks that receive the tracing that you send via Debug.WriteLine and Trace.WriteLine respectively. By default the Listeners collection contains a single sink, which is an instance of the DefaultTraceListener class. This sends output to the Win32 OutputDebugString() function and also the System.Diagnostics.Debugger.Log() method. This is useful when debugging, but if you're trying to trace a problem at a customer site, redirecting the output to a file is more appropriate. Fortunately, the TextWriterTraceListener class is provided for this purpose.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
What are the contents of assembly?
Answer : In general, a static assembly can consist of four elements: The assembly manifest, which contains assembly metadata. Type metadata. Microsoft intermediate language (MSIL) code that implements the types. A set of resources.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
What is GC (Garbage Collection) and how it works?
Answer : One of the good features of the CLR is Garbage Collection, which runs in the background collecting unused object references, freeing us from having to ensure we always destroy them. In reality the time difference between you releasing the object instance and it being garbage collected is likely to be very small, since the GC is always running. [The process of transitively tracing through all pointers to actively used objects in order to locate all objects that can be referenced, and then arranging to reuse any heap memory that was not found during this trace. The common language runtime garbage collector also compacts the memory that is in use to reduce the working space needed for the heap.] Heap: A portion of memory reserved for a program to use for the temporary storage of data structures whose existence or size cannot be determined until the program is running.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
Differnce between Managed code and unmanaged code ?
Answer : Managed Code: Code that runs under a "contract of cooperation" with the common language runtime. Managed code must supply the metadata necessary for the runtime to provide services such as memory management, cross-language integration, code access security, and automatic lifetime control of objects. All code based on Microsoft intermediate language (MSIL) executes as managed code. Un-Managed Code: Code that is created without regard for the conventions and requirements of the common language runtime. Unmanaged code executes in the common language runtime environment with minimal services (for example, no garbage collection, limited debugging, and so on). 
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
What is Reference type and value type ?
Answer : Reference Type: Reference types are allocated on the managed CLR heap, just like object types. A data type that is stored as a reference to the value's location. The value of a reference type is the location of the sequence of bits that represent the type's data. Reference types can be self-describing types, pointer types, or interface types Value Type: Value types are allocated on the stack just like primitive types in VBScript, VB6 and C/C++. Value types are not instantiated using new go out of scope when the function they are defined within returns. Value types in the CLR are defined as types that derive from system.valueType. A data type that fully describes a value by specifying the sequence of bits that constitutes the value's representation. Type information for a value type instance is not stored with the instance at run time, but it is available in metadata. Value type instances can be treated as objects using boxing.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
45. What is Boxing and unboxing ?
Answer : Boxing: The conversion of a value type instance to an object, which implies that the instance will carry full type information at run time and will be allocated in the heap. The Microsoft intermediate language (MSIL) instruction set's box instruction converts a value type to an object by making a copy of the value type and embedding it in a newly allocated object. Un-Boxing: The conversion of an object instance to a value type.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
What is JIT and how is works ?
Answer : An acronym for "just-in-time," a phrase that describes an action that is taken only when it becomes necessary, such as just-in-time compilation or just-in-time object activation
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
What is portable executable (PE) ?
Answer : The file format used for executable programs and for files to be linked together to form executable programs
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
What is strong name?
Answer : A name that consists of an assembly's identity”its simple text name, version number, and culture information (if provided)”strengthened by a public key and a digital signature generated over the assembly. Because the assembly manifest contains file hashes for all the files that constitute the assembly implementation, it is sufficient to generate the digital signature over just the one file in the assembly that contains the assembly manifest. Assemblies with the same strong name are expected to be identical
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
What is global assembly cache?
Answer : A machine-wide code cache that stores assemblies specifically installed to be shared by many applications on the computer. Applications deployed in the global assembly cache must have a strong name.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
What is difference between constants, readonly and, static ?
Answer : Constants: The value can™t be changed Read-only: The value will be initialized only once from the constructor of the class. Static: Value can be initialized once.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
What is difference between shared and public?
Answer : An assembly that can be referenced by more than one application. An assembly must be explicitly built to be shared by giving it a cryptographically strong name.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
What are the types of authentication in .net?
Answer : We have three types of authentication: 1. Form authentication 2. Windows authentication 3. Passport This has to be declared in web.config file.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
What is the difference between a Struct and a Class ?
Answer : The struct type is suitable for representing lightweight objects such as Point, Rectangle, and Color. Although it is possible to represent a point as a class, a struct is more efficient in some scenarios. For example, if you declare an array of 1000 Point objects, you will allocate additional memory for referencing each object. In this case, the struct is less expensive.When you create a struct object using the new operator, it gets created and the appropriate constructor is called. Unlike classes, structs can be instantiated without using the new operator. If you do not use new, the fields will remain unassigned and the object cannot be used until all of the fields are initialized. It is an error to declare a default (parameterless) constructor for a struct. A default constructor is always provided to initialize the struct members to their default values.It is an error to initialize an instance field in a struct.There is no inheritance for structs as there is for classes. A struct cannot inherit from another struct or class, and it cannot be the base of a class. Structs, however, inherit from the base class Object. A struct can implement interfaces, and it does that exactly as classes do. A struct is a value type, while a class is a reference type.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
How big is the datatype int in .NET?
Answer : 32 bits.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
How big is the char?
Answer : 16 bits (Unicode).
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
 How do you initiate a string without escaping each backslash?
Answer : Put an @ sign in front of the double-quoted string.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
What's the access level of the visibility type internal?
Answer : Current application.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
Explain encapsulation ?
Answer : The implementation is hidden, the interface is exposed.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
What data type should you use if you want an 8-bit value that's signed? sbyte.
Answer : Speaking of Boolean data types, what's different between C# and C/C++? There's no conversion between 0 and false, as well as any other number and true, like in C/C++.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
 Where do the reference-type variables go in the RAM?
Answer : The references go on the stack, while the objects themselves go on the heap. 
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
 What is the difference between the value-type variables and reference-type variables in terms of garbage collection? 
Answer : The value-type variables are not garbage-collected, they just fall off the stack when they fall out of scope, the reference-type objects are picked up by GC when their references go null.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
How do you convert a string into an integer in .NET?
Answer : Int32.Parse(string)
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
How do you box a primitive data type variable?
Answer : Assign it to the object, pass an object.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
Why do you need to box a primitive variable? 
Answer : To pass it by reference. 
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
What's the difference between Java and .NET garbage collectors?
Answer :  Sun left the implementation of a specific garbage collector up to the JRE developer, so their performance varies widely, depending on whose JRE you're using. Microsoft standardized on their garbage collection.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
How do you enforce garbage collection in .NET?
Answer : System.GC.Collect();
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
What's the difference between const and readonly?
Answer : You can initialize readonly variables to some runtime values. Let's say your program uses current date and time as one of the values that won't change. This way you declare public readonly string DateT = new DateTime().ToString(). What happens when you encounter a continue statement inside the for loop? The code for the rest of the loop is ignored, the control is transferred back to the beginning of the loop. 
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
 What's the advantage of using System.Text.StringBuilder over System.String?
Answer : StringBuilder is more efficient in the cases, where a lot of manipulation is done to the text. Strings are immutable, so each time it's being operated on, a new instance is created.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
What's the difference between the System.Array.CopyTo() and System.Array.Clone()?
Answer : The first one performs a deep copy of the array, the second one is shallow.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
How can you sort the elements of the array in descending order?
Answer : By calling Sort() and then Reverse() methods.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
What's class SortedList underneath?
Answer : A sorted HashTable.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
Can multiple catch blocks be executed?
Answer : No, once the proper catch code fires off, the control is transferred to the finally block (if there are any), and then whatever follows the finally block.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
Why is it a bad idea to throw your own exceptions?
Answer : Well, if at that point you know that an error has occurred, then why not write the proper code to handle that error instead of passing a new Exception object to the catch block? Throwing your own exceptions signifies some design flaws in the project.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
What's a delegate?
Answer : A delegate object encapsulates a reference to a method. In C++ they were referred to as function pointers.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
What's a multicast delegate?
Answer : It's a delegate that points to and eventually fires off several methods.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
How's the DLL Hell problem solved in .NET?
Answer : Assembly versioning allows the application to specify not only the library it needs to run (which was available under Win32), but also the version of the assembly.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
What are the ways to deploy an assembly?
Answer : An MSI installer, a CAB archive, and XCOPY command.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
What's a satellite assembly?
Answer : When you write a multilingual or multi-cultural application in .NET, and want to distribute the core application separately from the localized modules, the localized assemblies that modify the core application are called satellite assemblies.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
What namespaces are necessary to create a localized application?
Answer : System.Globalization, System.Resources.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
. What does assert() do?
Answer : In debug compilation, assert takes in a Boolean condition as a parameter, and shows the error dialog if the condition is false. The program proceeds without any interruption if the condition is true.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
What's the difference between the Debug class and Trace class?
Answer : Documentation looks the same. Use Debug class for debug builds, use Trace class for both debug and release builds.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
Why are there five tracing levels in System.Diagnostics.TraceSwitcher?
Answer : The tracing dumps can be quite verbose and for some applications that are constantly running you run the risk of overloading the machine and the hard drive there. Five levels range from None to Verbose, allowing to fine-tune the tracing activities.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
Where is the output of TextWriterTraceListener redirected?
Answer : To the Console or a text file depending on the parameter passed to the constructor.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
What namespaces are necessary to create a localized application?
Answer : System.Globalization, System.Resources.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
What are three test cases you should go through in unit testing?
Answer : Positive test cases (correct data, correct output), negative test cases (broken or missing data, proper handling), exception test cases (exceptions are thrown and caught properly).
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
Can you change the value of a variable while debugging a C# application?
Answer : Yes, if you are debugging via Visual Studio.NET, just go to Immediate window.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
What's the implicit name of the parameter that gets passed into the class' set method?
Answer : Value, and it's datatype depends on whatever variable we're changing.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
How do you inherit from a class in C#?
Answer : Place a colon and then the name of the base class. Notice that it's double colon in C++. Does C# support multiple inheritance? No, use interfaces instead.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
How's method overriding different from overloading?
Answer : When overriding, you change the method behavior for a derived class. Overloading simply involves having a method with the same name within the class.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
What does the keyword virtual mean in the method definition?
Answer : The method can be over-ridden.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
Can you declare the override method static while the original method is non-static?
Answer : No, you can't, the signature of the virtual method must remain the same, only the keyword virtual is changed to keyword override.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
Can you override private virtual methods?
Answer : No, moreover, you cannot access private methods in inherited classes, have to be protected in the base class to allow any sort of access.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
Can you prevent your class from being inherited and becoming a base class for some other classes?
Answer : Yes, that's what keyword sealed in the class definition is for. The developer trying to derive from your class will get a message: cannot inherit from Sealed class WhateverBaseClassName. It's the same concept as final class in Java.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
Can you allow class to be inherited, but prevent the method from being over-ridden?
Answer : Yes, just leave the class public and make the method sealed.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
Why can't you specify the accessibility modifier for methods inside the interface?
Answer : They all must be public. Therefore, to prevent you from getting the false impression that you have any freedom of choice, you are not allowed to specify any accessibility, it's public by default.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
Can you inherit multiple interfaces?
Answer : Yes, why not.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
And if they have conflicting method names?
Answer : It's up to you to implement the method inside your own class, so implementation is left entirely up to you. This might cause a problem on a higher-level scale if similarly named methods from different interfaces expect different data, but as far as compiler cares you're okay.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
What's the difference between an interface and abstract class?
Answer : In the interface all methods must be abstract, in the abstract class some methods can be concrete. In the interface no accessibility modifiers are allowed, which is ok in abstract classes.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
How can you overload a method?
Answer : Different parameter data types, different number of parameters, different order of parameters.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
If a base class has a bunch of overloaded constructors, and an inherited class has another bunch of overloaded constructors, can you enforce a call from an inherited constructor to an arbitrary base constructor? 
Answer : Yes, just place a colon, and then keyword base (parameter list to invoke the appropriate constructor) in the overloaded constructor definition inside the inherited class.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
What's the difference between System.String and System.StringBuilder classes?
Answer : System.String is immutable, System.StringBuilder was designed with the purpose of having a mutable string where a variety of operations can be performed.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
Does C# support multiple-inheritance?
Answer : No, use interfaces instead.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
When you inherit a protected class-level variable, who is it available to?
Answer : The derived class. Are private class-level variables inherited? Yes, but they are not accessible. Although they are not visible or accessible via the class interface, they are inherited.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
Describe the accessibility modifier "protected internal".
Answer : It is available to derived classes and classes within the same Assembly (and naturally from the base class it's declared in).
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
What's the advantage of using System.Text.StringBuilder over System.String?
Answer : StringBuilder is more efficient in cases where there is a large amount of string manipulation. Strings are immutable, so each time it's being operated on, a new instance is created.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
Can you store multiple data types in System.Array?
Answer : No. What's the .NET class that allows the retrieval of a data element using a unique key?
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
What's an abstract class?
Answer : A class that cannot be instantiated. An abstract class is a class that must be inherited and have the methods overridden. An abstract class is essentially a blueprint for a class without any implementation.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
When do you absolutely have to declare a class as abstract?
Answer : 1. When at least one of the methods in the class is abstract. 2. When the class itself is inherited from an abstract class, but not all base abstract methods have been overridden.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
What's an interface?
Answer : It's an abstract class with public abstract methods all of which must be implemented in the inherited classes.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
Why can't you specify the accessibility modifier for methods inside the interface?
Answer : They all must be public. Therefore, to prevent you from getting the false impression that you have any freedom of choice, you are not allowed to specify any accessibility, it's public by default.  
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
What's the difference between an interface and abstract class?
Answer : In an interface class, all methods must be abstract. In an abstract class some methods can be concrete. In an interface class, no accessibility modifiers are allowed, which is ok in an abstract class.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
How is method overriding different from method overloading?
Answer : When overriding a method, you change the behavior of the method for the derived class. Overloading a method simply involves having another method with the same name within the class.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
Can you declare an override method to be static if the original method is non-static?
Answer : No. The signature of the virtual method must remain the same, only the keyword virtual is changed to keyword override.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
Can you override private virtual methods?
Answer : No. Private methods are not accessible outside the class. 
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
Can you write a class without specifying namespace? Which namespace does it belong to by default?
Answer : Yes, you can, then the class belongs to global namespace which has no name. For commercial products, naturally, you wouldn't want global namespace.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
What are the Main Features of .NET platform?
Answer : Features of .NET Platform are :-  Common Language Runtime Explains the features and benefits of the common language runtime, a run-time environment that manages the execution of code and provides services that simplify the development process. Assemblies Defines the concept of assemblies, which are collections of types and resources that form logical units of functionality. Assemblies are the fundamental units of deployment, version control, reuse, activation scoping, and security permissions. Application Domains Explains how to use application domains to provide isolation between applications. Runtime Hosts Describes the runtime hosts supported by the .NET Framework, including ASP.NET, Internet Explorer, and shell executables. Common Type System Identifies the types supported by the common language runtime. Metadata and Self-Describing Components Explains how the .NET Framework simplifies component interoperation by allowing compilers to emit additional declarative information, or metadata, into all modules and assemblies. Cross-Language Interoperability Explains how managed objects created in different programming languages can interact with one another. .NET Framework Security Describes mechanisms for protecting resources and code from unauthorized code and unauthorized users. .NET Framework Class Library Introduces the library of types provided by the .NET Framework, which expedites and optimizes the development process and gives you access to system functionality. 
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
What is the use of JIT ?
Answer : JIT (Just - In - Time) is a compiler which converts MSIL code to Native Code (ie.. CPU-specific code that runs on the same computer architecture). Because the common language runtime supplies a JIT compiler for each supported CPU architecture, developers can write a set of MSIL that can be JIT-compiled and run on computers with different architectures. However, your managed code will run only on a specific operating system if it calls platform-specific native APIs, or a platform-specific class library. JIT compilation takes into account the fact that some code might never get called during execution. Rather than using time and memory to convert all the MSIL in a portable executable (PE) file to native code, it converts the MSIL as needed during execution and stores the resulting native code so that it is accessible for subsequent calls. The loader creates and attaches a stub to each of a type's methods when the type is loaded. On the initial call to the method, the stub passes control to the JIT compiler, which converts the MSIL for that method into native code and modifies the stub to direct execution to the location of the native code. Subsequent calls of the JIT-compiled method proceed directly to the native code that was previously generated, reducing the time it takes to JIT-compile and run the code. 
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
 What meant of assembly & global assembly cache (gac) & Meta data.
Answer : Assembly :-- An assembly is the primary building block of a .NET based application. It is a collection of functionality that is built, versioned, and deployed as a single implementation unit (as one or more files). All managed types and resources are marked either as accessible only within their implementation unit, or as accessible by code outside that unit. It overcomes the problem of 'dll Hell'.The .NET Framework uses assemblies as the fundamental unit for several purposes: · Security · Type Identity · Reference Scope · Versioning · Deployment Global Assembly Cache :-- Assemblies can be shared among multiple applications on the machine by registering them in global Assembly cache(GAC). GAC is a machine wide a local cache of assemblies maintained by the .NET Framework. We can register the assembly to global assembly cache by using gacutil command. We can Navigate to the GAC directory, C:\winnt\Assembly in explore. In the tools menu select the cache properties; in the windows displayed you can set the memory limit in MB used by the GAC MetaData :--Assemblies have Manifests. This Manifest contains Metadata information of the Module/Assembly as well as it contains detailed Metadata of other assemblies/modules references (exported). It's the Assembly Manifest which differentiates between an Assembly and a Module. 
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
What are the mobile devices supported by .net platform
Answer : The Microsoft .NET Compact Framework is designed to run on mobile devices such as mobile phones, Personal Digital Assistants (PDAs), and embedded devices. The easiest way to develop and test a Smart Device Application is to use an emulator. These devices are divided into two main divisions: 1) Those that are directly supported by .NET (Pocket PCs, i-Mode phones, and WAP devices) 2) Those that are not (Palm OS and J2ME-powered devices).
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
What is GUID , why we use it and where?
Answer : GUID :-- GUID is Short form of Globally Unique Identifier, a unique 128-bit number that is produced by the Windows OS or by some Windows applications to identify a particular component, application, file, database entry, and/or user. For instance, a Web site may generate a GUID and assign it to a user's browser to record and track the session. A GUID is also used in a Windows registry to identify COM DLLs. Knowing where to look in the registry and having the correct GUID yields a lot information about a COM object (i.e., information in the type library, its physical location, etc.). Windows also identifies user accounts by a username (computer/domain and username) and assigns it a GUID. Some database administrators even will use GUIDs as primary key values in databases. GUIDs can be created in a number of ways, but usually they are a combination of a few unique settings based on specific point in time (e.g., an IP address, network MAC address, clock date/time, etc.).  Describe the difference between inline and code behind - which is best in a loosely coupled solution  ASP.NET supports two modes of page development: Page logic code that is written inside runat="server"> blocks within an .aspx file and dynamically compiled the first time the page is requested on the server. Page logic code that is written within an external class that is compiled prior to deployment on a server and linked ""behind"" the .aspx file at run time.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
 What is MSIL? and why should my developers need an appreciation of it if at all?
Answer : When compiling the source code to managed code, the compiler translates the source into Microsoft intermediate language (MSIL). This is a CPU-independent set of instructions that can efficiently be converted to native code. Microsoft intermediate language (MSIL) is a translation used as the output of a number of compilers. It is the input to a just-in-time (JIT) compiler. The Common Language Runtime includes a JIT compiler for the conversion of MSIL to native code. Before Microsoft Intermediate Language (MSIL) can be executed it, must be converted by the .NET Framework just-in-time (JIT) compiler to native code. This is CPU-specific code that runs on the same computer architecture as the JIT compiler. Rather than using time and memory to convert all of the MSIL in a portable executable (PE) file to native code. It converts the MSIL as needed whilst executing, then caches the resulting native code so its accessible for any subsequent calls.  How many .NET languages can a single .NET DLL contain?
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
Whats an assembly? 
Answer : Assemblies are the building blocks of .NET Framework applications; they form the fundamental unit of deployment, version control, reuse, activation scoping, and security permissions. An assembly is a collection of types and resources that are built to work together and form a logical unit of functionality. An assembly provides the common language runtime with the information it needs to be aware of type implementations. To the runtime, a type does not exist outside the context of an assembly. 141.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
What is manifest?
Answer : It is the metadata that describes the assemblies.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
What is metadata?
Answer : Metadata is machine-readable information about a resource, or ""data about data."" Such information might include details on content, format, size, or other characteristics of a data source. In .NET, metadata includes type definitions, version information, external assembly references, and other standardized information.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
What are the types of assemblies?
Answer : There are four types of assemblies in .NET: Static assemblies These are the .NET PE files that you create at compile time. Dynamic assemblies These are PE-formatted, in-memory assemblies that you dynamically create at runtime using the classes in the System.Reflection.Emit namespace. Private assemblies These are static assemblies used by a specific application. Public or shared assemblies These are static assemblies that must have a unique shared name and can be used by any application. An application uses a private assembly by referring to the assembly using a static path or through an XML-based application configuration file. While the CLR doesn't enforce versioning policies-checking whether the correct version is used-for private assemblies, it ensures that an application uses the correct shared assemblies with which the application was built. Thus, an application uses a specific shared assembly by referring to the specific shared assembly, and the CLR ensures that the correct version is loaded at runtime. In .NET, an assembly is the smallest unit to which you can associate a version number; 
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
 What are delegates?where are they used ?
Answer : A delegate defines a reference type that can be used to encapsulate a method with a specific signature. A delegate instance encapsulates a static or an instance method. Delegates are roughly similar to function pointers in C++; however, delegates are type-safe and secure.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
 When do you use virutal keyword?.
Answer : When we need to override a method of the base class in the sub class, then we give the virtual keyword in the base class method. This makes the method in the base class to be overridable. Methods, properties, and indexers can be virtual, which means that their implementation can be overridden in derived classes. 
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
 What are class access modifiers ?
Answer : Access modifiers are keywords used to specify the declared accessibility of a member or a type. This section introduces the four access modifiers: · Public - Access is not restricted. · Protected - Access is limited to the containing class or types derived from the containing class. · Internal - Access is limited to the current assembly. · Protected inertnal - Access is limited to the current assembly or types derived · from the containing class. · Private - Access is limited to the containing type.  
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
 What Is Boxing And Unboxing?
Answer : Boxing :- Boxing is an implicit conversion of a value type to the type object type Eg:- Consider the following declaration of a value-type variable: int i = 123; object o = (object) i; Boxing Conversion UnBoxing :- Unboxing is an explicit conversion from the type object to a value type Eg: int i = 123; // A value type object box = i; // Boxing int j = (int)box; // Unboxing 
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
What is Value type and refernce type in .Net?.
Answer : Value Type : A variable of a value type always contains a value of that type. The assignment to a variable of a value type creates a copy of the assigned value, while the assignment to a variable of a reference type creates a copy of the reference but not of the referenced object. The value types consist of two main categories: * Stuct Type * Enumeration Type Reference Type :Variables of reference types, referred to as objects, store references to the actual data. This section introduces the following keywords used to declare reference types: * Class * Interface * Delegate This section also introduces the following built-in reference types: * object * string 
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
What is the difference between structures and enumeration?.
Answer : Unlike classes, structs are value types and do not require heap allocation. A variable of a struct type directly contains the data of the struct, whereas a variable of a class type contains a reference to the data. They are derived from System.ValueType class. Enum->An enum type is a distinct type that declares a set of named constants.They are strongly typed constants. They are unique types that allow to declare symbolic names to integral values. Enums are value types, which means they contain their own value, can't inherit or be inherited from and assignment copies the value of one enum to another. public enum Grade { A, B, C }
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
 What is namespaces?.
Answer : Namespace is a logical naming scheme for group related types.Some class types that logically belong together they can be put into a common namespace. They prevent namespace collisions and they provide scoping. They are imported as "using" in C# or "Imports" in Visual Basic. It seems as if these directives specify a particular assembly, but they don't. A namespace can span multiple assemblies, and an assembly can define multiple namespaces. When the compiler needs the definition for a class type, it tracks through each of the different imported namespaces to the type name and searches each referenced assembly until it is found. Namespaces can be nested. This is very similar to packages in Java as far as scoping is concerned.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
How do you create shared assemblies?.
Answer : Just look through the definition of Assemblies.. * An Assembly is a logical unit of code * Assembly physically exist as DLLs or EXEs * One assembly can contain one or more files * The constituent files can include any file types like image files, text files etc. along with DLLs or EXEs * When you compile your source code by default the exe/dll generated is actually an assembly * Unless your code is bundled as assembly it can not be used in any other application * When you talk about version of a component you are actually talking about version of the assembly to which the component belongs. * Every assembly file contains information about itself. This information is called as Assembly Manifest. Following steps are involved in creating shared assemblies : * Create your DLL/EXE source code * Generate unique assembly name using SN utility * Sign your DLL/EXE with the private key by modifying AssemblyInfo file * Compile your DLL/EXE * Place the resultant DLL/EXE in global assembly cache using AL utility
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
 What is global assembly cache?
Answer :  Each computer where the common language runtime is installed has a machine-wide code cache called the global assembly cache. The global assembly cache stores assemblies specifically designated to be shared by several applications on the computer. There are several ways to deploy an assembly into the global assembly cache: · Use an installer designed to work with the global assembly cache. This is the preferred option for installing assemblies into the global assembly cache. · Use a developer tool called the Global Assembly Cache tool (Gacutil.exe), provided by the .NET Framework SDK. · Use Windows Explorer to drag assemblies into the cache. 
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
What is MSIL?.
Answer :  When compiling to managed code, the compiler translates your source code into Microsoft intermediate language (MSIL), which is a CPU-independent set of instructions that can be efficiently converted to native code. MSIL includes instructions for loading, storing, initializing, and calling methods on objects, as well as instructions for arithmetic and logical operations, control flow, direct memory access, exception handling, and other operations. Before code can be run, MSIL must be converted to CPU-specific code, usually by a just-in-time (JIT) compiler. Because the common language runtime supplies one or more JIT compilers for each computer architecture it supports, the same set of MSIL can be JIT-compiled and run on any supported architecture. When a compiler produces MSIL, it also produces metadata. Metadata describes the types in your code, including the definition of each type, the signatures of each type's members, the members that your code references, and other data that the runtime uses at execution time. The MSIL and metadata are contained in a portable executable (PE) file that is based on and extends the published Microsoft PE and common object file format (COFF) used historically for executable content. This file format, which accommodates MSIL or native code as well as metadata, enables the operating system to recognize common language runtime images. The presence of metadata in the file along with the MSIL enables your code to describe itself, which means that there is no need for type libraries or Interface Definition Language (IDL). The runtime locates and extracts the metadata from the file as needed during execution. 
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
What is Jit compilers?.how many are available in clr?
Answer :  Just-In-Time compiler- it converts the language that you write in .Net into machine language that a computer can understand. there are tqo types of JITs one is memory optimized & other is performace optimized. 
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
. What is tracing?Where it used.Explain few methods available Tracing refers to collecting information about the application while it is running. 
Answer : You use tracing information to troubleshoot an application. Tracing allows us to observe and correct programming errors. Tracing enables you to record information in various log files about the errors that might occur at run time. You can analyze these log files to find the cause of the errors. In .NET we have objects called Trace Listeners. A listener is an object that receives the trace output and outputs it somewhere; that somewhere could be a window in your development environment, a file on your hard drive, a Windows Event log, a SQL Server or Oracle database, or any other customized data store. The System.Diagnostics namespace provides the interfaces, classes, enumerations and structures that are used for tracing The System.Diagnostics namespace provides two classes named Trace and Debug that are used for writing errors and application execution information in logs.All Trace Listeners have the following functions. Functionality of these functions is same except that the target media for the tracing output is determined by the Trace Listener. Method Name Result Fail Outputs the specified text with the Call Stack. Write Outputs the specified text. WriteLine Outputs the specified text and a carriage return. Flush Flushes the output buffer to the target media. Close Closes the output stream in order to not receive the tracing/debugging output.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
How to set the debug mode?
Answer :  Debug Mode for ASP.NET applications - To set ASP.NET appplication in debugging mode, edit the application's web.config and assign the "debug" attribute in section to "true" as show below: .... ... .. This case-sensitive attribute 'debug tells ASP.NET to generate symbols for dynamically generated files and enables the debugger to attach to the ASP.NET application. ASP.NET will detect this change automatically, without the need to restart the server. Debug Mode for ASP.NET Webservices - Debugging an XML Web service created with ASP.NET is similar to the debugging an ASP.NET Web application. 
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
What is the property available to check if the page posted or not? 
Answer : The Page_Load event handler in the page checks for IsPostBack property value, to ascertain whether the page is posted. The Page.IsPostBack gets a value indicating whether the page is being loaded in response to the client postback, or it is for the first time. The value of Page.IsPostBack is True, if the page is being loaded in response to the client postback; while its value is False, when the page is loaded for the first time. The Page.IsPostBack property facilitates execution of certain routine in Page_Load, only once (for e.g. in Page load, we need to set default value in controls, when page is loaded for the first time. On post back, we check for true value for IsPostback value and then invoke server-side code to update data). 
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
Which are the abstract classes available under system.xml namespace? 
Answer : The System.XML namespace provides XML related processing ability in .NET framework. XmlReader and XMLWriter are the two abstract classes at the core of .NET Framework XML classes: 1. XmlReader provides a fast, forward-only, read-only cursor for processing an XML document stream. 2. XmlWriter provides an interface for producing XML document streams that conform to the W3C's XML standards. Both XmlReader and XmlWriter are abstract base classes, which define the functionality that all derived classes must support.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
Is it possible to use multipe inheritance in .net? 
Answer : Multiple Inheritance is an ability to inherit from more than one base class i.e. ability of a class to have more than one superclass, by inheriting from different sources and thus combine separately-defined behaviors in a single class. There are two types of multiple inheritance: multiple type/interface inheritance and multiple implementation inheritance. C# & VB.NET supports only multiple type/interface inheritance, i.e. you can derive an class/interface from multiple interfaces. There is no support for multiple implementation inheritance in .NET. That means a class can only derived from one class.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
What are the derived classes from xmlReader and xmlWriter? 
Answer : Both XmlReader and XmlWriter are abstract base classes, which define the functionality that all derived classes must support. There are three concrete implementations of XmlReader: 1.XmlTextReader 2.XmlNodeReader 3.XmlValidatingReader There are two concrete implementations of XmlWriter: 1.XmlTextWriter 2.XmlNodeWriter XmlTextReader and XmlTextWriter support reading data to/from text-based stream, while XmlNodeReader and XmlNodeWriter are designed for working with in-memory DOM tree structure. The custom readers and writers can also be developed to extend the built-in functionality of XmlReader and XmlWriter.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
What is managed and unmanaged code? 
Answer : The .NET framework provides several core run-time services to the programs that run within it - for example exception handling and security. For these services to work, the code must provide a minimum level of information to the runtime. i.e., code executing under the control of the CLR is called managed code. For example, any code written in C# or Visual Basic .NET is managed code. Code that runs outside the CLR is referred to as "unmanaged code." COM components, ActiveX components, and Win32 API functions are examples of unmanaged code.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
How you deploy .NET assemblies?
Answer :  One way is simply use xcopy. others are use and the setup projects in .net. and one more way is use of nontuch deployment.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
What is Globalizationa and Localization ? 
Answer : Globalization is the process of creating an application that meets the needs of users from multiple cultures. It includes using the correct currency, date and time format, calendar, writing direction, sorting rules, and other issues. Accommodating these cultural differences in an application is called localization.Using classes of System.Globalization namespace, you can set application's current culture. This can be achieved by using any of the following 3 approaches. 1. Detect and redirect 2. Run-time adjustment 3. Using Satellite assemblies.
Date submitted :8/8/2009 1:03:38 AMSubmitted by :shabir@myfaithsolution.com
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