C# Late Binding

In Object Oriented Programming, Polymorphism allows programmers to have same interface for different type of Objects. Depending upon the type of object, interface produces different results.

This is called late-binding. In C#, it is achieved by combination of virtual functions, derived classes, and with 'new' & 'override' keywords.

using System;

public class Parent
{
public virtual void Print()
{
Console.WriteLine ("This is parent class");

}

public virtual void Print2()
{
Console.WriteLine ("Print2: This is parent class");

}

}

public class Child : Parent
{
public override void Print()
{
Console.WriteLine ("This is child class");
}

public new void Print()
{
Console.WriteLine ("Print2: This is child class");
}

}

public class MyClass

{

public static void Main()
{
Parent p;
p = new Parent();
p.Print(); p.Print2();
p = new Child();
p.Print(); p.Print2();
}

}

Following is the output:

This is parent class
Print2: This is parent class
This is child class
Print2: This is parent class

If we use 'new' keyword instead of 'override' keyword, it doesn't override base class function but hide it from base class object.