Answer / pugal

When creating a standalone project which can be
changed at will, use an interface in preference to an
abstract class; because, it offers more design flexibility.

Use an interface to design a polymorphic hierarchy
for value types.

Use an interface when an immutable contract is
really intended.

A well-designed interface defines a very specific
range of functionality. Split up interfaces that contain
unrelated functionality.

Answer / kalaimani

The interface contains only declaration of methods, no implementation. Because the interface is can be inherited by class and struct.

Answer / venkatesan

Interface is a contract which declares a method inside and
gives the implementation in different classes using
polymorphism. we cannot create a object to an interface but
we can create a reference for an interface.

Answer / siddu.

Interfaces are used to define common functionality among the
child classes or struts.

Interfaces can be used to implement some rules on the
derived classes or struts.

Interface are used to hold object of a class which derives
it in client machine in case of remoting.

Answer / ankita

In the phase of interfaces we can only declare methods. and
this method can contain its definition in the different
classes where we can define it.........

Answer / ravindarjobs

have a look at this link

http://msdn2.microsoft.com/en-us/library/3b5b8ezk.aspx

Answer / satyaprakash reddy

c#.net will not support multiple inheritence to overcome
these problems we use interfaces,
actually c# is faces some problems while go through the
garbage collection and interfaces are better according to
performance

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