using System;

public class Program

{

    class A {

    }

    class B: A {

    }

    class C {

    }

    public static void Main()

    {

        B b = new B();

        Console.WriteLine(b.GetType().IsSubclassOf(typeof(A)));

        Console.WriteLine(typeof(B).IsSubclassOf(typeof(A)));

        Console.Write(typeof(C).IsSubclassOf(typeof(A)));

    }

}