Web Reference: In order to be abstract, class A must have the MustInherit keyword. Abstract (MustInherit) means that this class serves as base class only and cannot be instantiated with New. It also allows you to declare abstract (MustOverride) members with no implementation, i.e. no method body. This is a detailed analysis of abstract classes and methods in VB.NET with some concrete examples. As you can see, we have provided an implementation for the CalculateArea() abstract method in both child classes Circle and Rectangle with their implementation by calculating the area of circle and rectangle respectively.
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