is operator in class hiearchy : is « Operator « C# / CSharp Tutorial

1. C# / CSharp Tutorial
2. Operator
3. is

using System; 
 
class A {} 
class B : A {} 
 
class MainClass { 
  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"); 
  } 
}

a is an A
b is an A because it is derived from A
B is a B
a is an object