Answer Posted / saqib khan mca 2009 galgotia g

1>Abstract class can have implementations of some methods
while interface can't have any implementations but
declarations of methods.

2>Abstract class can use various access modifiers while
interface doesn't use any access modifiers.

3>Abstract class doesn't support multiple inheritance while
interface's major use is to implement multiple and hybrid
inheritance.

4>Abstract class can have properties,data members,
constructors,static,const,readonly etc.while interface
doesn't implement these but properties.

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