Answer Posted / munwar

Interface and abstract class are just same,but both have
their own usability and advantages..

Difference b/w both.
1). Interface is highlevel abstract(means there is no
single implementation), but in abstract class there can be
implementation.
2)Interface does not allow accessfiers like
public,private.. but abstract class allow these accessifiers

3) Interface does not supports contant values but abstract
calss supports constatnt values..

4) Interface supports multiple inheritance but class does
not support multiple inheritance..

5).interface can not implement abstract class but abstract
calss can impelment interface...

If the interface in c# only contains the declaration of the methods and we need to define those methods in the class, then why we use the interface?

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