Difference between Abstract Class and Polymorphism in C#

 

Here are the points of difference between abstract class and polymorphism:

• Abstract class is a base class. Cannot create instance whether it may be base class or not. But in polymorphism, we can create instance to base class.
  
  
• In abstract class, we use abstract keyword to method but in polymorphism uses virtual keyword to base class method.
  
  
• In abstract class, we can declare abstract method inside abstract method and can define method which class derived abstract class.
  
  
• In polymorphism, declaration and definition are only inside corresponding class.
  
  
• In polymorphism, we can access derived class method through base class, but in abstract class we cannot access derived class method threw base class because cannot create an object to base class.
  
  
• Abstract method declares only inside abstract class, but we can declare virtual method inside a class as well (it should be a base class).