MustInherit and MustOverride Keywords
Inheritance is powerful because it enables building custom objects’ frameworks. In this context, an object can represent the base infrastructure for different kinds of classes. You saw how the Person class is the base infrastructure for the Customer, Employee, and Contact derived classes. Because of its implementation, the Person class does nothing special. It has a generic behavior, and you will probably never create instances of that class; it is more likely that you will create instances of its derived classes. In this scenario, therefore, when you have a general-purpose base class that acts just as a basic infrastructure for derived classes, you can force a class to be inherited so it cannot be used directly. ...
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