Polymorphism

Polymorphism (OOPS Principal): Poly + Morphism (Poly means Many and Morphism means change or faces/ behaviors)
Definition: Object changes behavior according to the condition. (one name having multiple forms)

There are two types:
1) Static or compile-time Polymorphism (eg: Method overloading, operator overloading)

2) Dynamic or run-time Polymorphism (eg: overriding using virtual and override keywords with inheritance)

Static Polymorphism: or Method Overloading

Example :  (at compile-time, the compiler decides which method to call)

class Program {   static void Main(string[] args)   {      Mathematics mathObj = new Mathematics();      mathObj.Add(1,2);      mathObj.Add(1,2,3);      Console.ReadLine();   } } class Mathematics {   public void Add(int value1, int value2)   {      Int result = value1 + value2;      Console.Writeline(result);   } public void Add(int value1, int value2, int value3)   {      Int result = value1 + value2 + value3;      Console.WriteLine(result);   } } Dynamic Polymorphism: (Inheritance, Virtual and Overriding) Example: (at run-time, the compiler will decide which method to call) class Program {   static void Main(string[] args)   { // if we have one parent class with so many child classes, at runtime parent // class instance can call or point to any of the child class override mathod.       BaseClass obj = new ChildClass(); // parent class can now point to the child class      obj.Test();   } } class BaseClass {   public virtual void Test()   {      Console.Writeline("BaseClass Method");   } } class ChildClass : BaseClass {  public override void Test()   {      Console.Writeline("ChildClass Method");   } } Reference: csharpcorner & Questpond