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Possible Duplicates:
interface and abstract class.
Abstract classes vs Interfaces
Can anyone tell me when one should use an abstract class and when one should use an interface with sample scenarios?
If you’re defining behavior (like
IEnumerable, since aListacts like anIEnumerable), then use an interface, but if you’re defining a kind of object (an IS-A) relationship, use an abstract class (likeStream— since aMemoryStreamIS-AStream).