=> We can not create object of a abstract class.
=> Abstract class is designed to act as a base class ( to be inherited by other class )
=> Abstract classes are similar to interfaces. After declaring an abstract class, It can not be instantiated on it's own it must be inherited.
=> In VB.Net abstract classes are created using "MustInherit" keword. In C# we have "Abstract" key word.
=> Abstract classes can have implementation or pure abstract methods which should be implemented in the child class.
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