[Solved] Not able to create an object of both the class why in c#?

Question

Your code already shows you making a new A() and a new B(). There is no AB(). By the nature of inheritance, a B is already an A; every B is also an A – just a more specific sub-type.

A B = new AB();

says “declare B to be a new variable of type A, and assign it the reference to a new instance of AB“. This would actually even compile if you create class AB : A. It probably isn’t what you meant to do, though.

Accepted Answer

Your code already shows you making a new A() and a new B(). There is no AB(). By the nature of inheritance, a B is already an A; every B is also an A – just a more specific sub-type.

A B = new AB();

says “declare B to be a new variable of type A, and assign it the reference to a new instance of AB“. This would actually even compile if you create class AB : A. It probably isn’t what you meant to do, though.