.NET FRAMEWORK INTERVIEW QUESTIONS
What is Interface based polymorphism ?
Answer:
Interfaces provide another way you can accomplish polymorphism in Visual Basic. Interfaces describe properties and methods like classes, but unlike classes, interfaces cannot provide any implementation. Multiple interfaces have the advantage of allowing systems of software components to evolve without breaking existing code.
To achieve polymorphism with interfaces, you implement an interface in different ways in several classes. Client applications can use either the old or the new implementations in exactly the same way. The advantage to interface-based polymorphism is that you do not need to re-compile existing client applications to get them to work with new interface implementations.
For More information:
http://msdn.microsoft.com/en-us/library/z9k8e08x%28v=vs.90%29
What is Deferred Execution of LiNQ ?
Answer:
http://blogs.msdn.com/b/charlie/archive/2007/12/09/deferred-execution.aspx
What is explicit implementation of Interfaces ?
http://msdn.microsoft.com/en-us/library/aa288461%28v=vs.71%29.aspx
What is Keyword Extern ?
Answer:
The extern modifier is used to declare a method that is implemented externally. A common use of the extern modifier is with the DllImport attribute when you are using Interop services to call into unmanaged code .
http://msdn.microsoft.com/en-us/library/e59b22c5%28v=vs.90%29.aspx
Tell me about constructor Hierarchy ?
http://www.yoda.arachsys.com/csharp/constructors.html
How GC(Garbage Collector) will evaluates an object is unused ?
http://msdn.microsoft.com/en-us/library/system.gc%28v=vs.90%29.aspx
What is the difference between interface and abstract class ?
Difference between Interface and abstract class :
The
choice of whether to design your functionality as an interface or an
abstract class (a MustInherit class in Visual Basic) can sometimes be a
difficult one. An abstract class is a class that cannot be instantiated,
but must be inherited from. An abstract class may be fully implemented,
but is more usually partially implemented or not implemented at all,
thereby encapsulating common functionality for inherited classes. For
details, see Abstract Classes.
An
interface, by contrast, is a totally abstract set of members that can
be thought of as defining a contract for conduct. The implementation of
an interface is left completely to the developer.
Both interfaces and
abstract classes are useful for component interaction. If a method
requires an interface as an argument, then any object that implements
that interface can be used in the argument.
This method
could accept any object that implemented IWidget as the widget argument,
even though the implementations of IWidget might be quite different.
Abstract classes also allow for this kind of polymorphism, but with a
few caveats:
Classes may inherit from only one base class, so if
you want to use abstract classes to provide polymorphism to a group of
classes, they must all inherit from that class.
Abstract classes may
also provide members that have already been implemented. Therefore, you
can ensure a certain amount of identical functionality with an abstract
class, but cannot with an interface.
Here are some
recommendations to help you to decide whether to use an interface or an
abstract class to provide polymorphism for your components.
If you anticipate creating multiple versions of your component, create an abstract class. Abstract classes provide a simple and easy way to version your components. By updating the base class, all inheriting classes are automatically updated with the change. Interfaces, on the other hand, cannot be changed once created. If a new version of an interface is required, you must create a whole new interface.
If the functionality
you are creating will be useful across a wide range of disparate
objects, use an interface. Abstract classes should be used primarily for
objects that are closely related, whereas interfaces are best suited
for providing common functionality to unrelated classes.
If you are
designing small, concise bits of functionality, use interfaces. If you
are designing large functional units, use an abstract class.
If you want to provide common,
implemented functionality among all implementations of your component,
use an abstract class. Abstract classes allow you to partially implement
your class, whereas interfaces contain no implementation for any
members.
What is Generics and the need of generics ?
Difference between list and sorted list ?
What is the scope of Session ?
What is the property to know is Client is connected ?
What are all the new key words introduced in .Net 4.0 ?
What is the default access modifier for a class ?
Answer: Private
What is GetHashCode?
Ans: GetHashCode Serves as a hash function for a particular type.
http://msdn.microsoft.com/en-us/library/system.object.gethashcode.aspx
Can we have a abstract class without any any abstract method in it ?
Yes
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