Define abstract class in C#.NET. - Abstract class cannot be instantiated. - Same concept in C++ known as pure virtual method. - A class that must be inherited and have the methods over-ridden. - A class without any implementation. What is an abstract class? An abstract class is a class that can't be instantiated. It is just the blueprint for a class without any implementation. You can inherit the class and have the methods over-ridden.
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