cse.jai

 Profile Answers by cse.jai 

• Jan 20th, 2012

 

An abstract class is a class that 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.

Virtual methods and properties enable derived classes to extend a base class without needing to use the base class implementation of a method. For more information check this link http://msdn.microsoft.com/en-us/library/6fawty39.aspx

Source: msdn