using System;

public class Animal 

{

    public void Sleep() 

    { 

        Console.WriteLine("I'm sleeping like an animal"); 

    }

}

​

public class Cat : Animal

{

    public new void Sleep() 

    { 

        Console.WriteLine("I'm a dreaming tiger!"); 

    }

}

​

public class Program

{

    public static void Main()

    {

        var cat = new Cat();

        cat.Sleep();

    }

}