Demonstrate is : Operator is as : Language Basics C# Source Code

    

/*
C#: The Complete Reference 
by Herbert Schildt 

Publisher: Osborne/McGraw-Hill (March 8, 2002)
ISBN: 0072134852
*/


// Demonstrate is. 
 
using System; 
 
class A {} 
class B : A {} 
 
public class UseIs { 
  public static void Main() { 
    A a = new A(); 
    B b = new B(); 
 
    if(a is A) Console.WriteLine("a is an A"); 
    if(b is A)  
      Console.WriteLine("b is an A because it is derived from A"); 
    if(a is B)  
      Console.WriteLine("This won't display -- a not derived from B"); 
 
    if(b is B) Console.WriteLine("B is a B"); 
    if(a is object) Console.WriteLine("a is an Object"); 
  } 
}