Runtime polymorphism and compiletime polymorphism

Polymorphism is one of type of oops I.e object oriented programming. It says that Polymorphism is just a method with same name showing one to many characteristics.

For example method with same names in a class but with different no of parameters values exhibit different behavior for the same method name.

shape(int x)

shape(int x,int y)

Types of Polymorphism:

Compiletime Polymorphism :

It is known as method overloading

Example:

Class area
{
 Public calcArea (int x)
 {
 }
Public calcArea (int x, int y)
 {

 }

Public calcArea (int x, int y, int z)
 {
 }
}

Runtime polymorphism:
It is known as method overriding.

Example:

class Class2 

    {

        static void Main(string[] args)

        {

            Area a = new Area2();

            int x = a.calcArea(5);

            Console.WriteLine("Result" + x);

            Console.ReadLine();

        }

    }

    class Area2 : Area

    {

         public override int calcArea(int x)

         {

             return x * x;

         }

    }

    class Area

    {

        public virtual int calcArea(int x)

        {

            return x + x;

        }

    }