What is an abstract class?
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What is an abstract class?
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An abstract class defines an interface for derived classes. It is partially implemented and provides design convenience. An abstract class is made up of one or more abstract methods that are declared but left unimplemented. It may also contain non-abstract methods. It cannot be instantiated directly. However, new classes can be derived from abstract classes. In Visual C# .NET, abstract classes are declared by using the abstract keyword.
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