Ability will never catch up with the demand for it.
Abstract and Sealed Classes and Class Members
The abstract keyword enables you to create classes and class members that are incomplete and must be implemented in a derived class. The sealed keyword enables you to prevent the inheritance of a class or certain class members that were previously marked virtual. Abstract Classes and Class Members Classes can be declared as abstract by putting the keyword abstract before the class definition . For example: An abstract class cannot be instantiated. The purpose of an abstract class is to provide a common definition of a base class that multiple derived classes can share. For example, a class library may define an abstract class that is used as a parameter to many of its functions, and require programmers using that library to provide their own implementation of the class by creating a derived class. Abstract classes may also define abstract methods. This is accomplished by adding the keyword abstract before the return type of the method. For example: Abstract methods have no i...
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