using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine(string.IsNullOrEmpty(null));

        Console.WriteLine(string.IsNullOrEmpty(" "));

        Console.WriteLine(string.IsNullOrEmpty(""));

        Console.WriteLine("--------------WhiteSpace----------------");

        Console.WriteLine(string.IsNullOrWhiteSpace(null));

        Console.WriteLine(string.IsNullOrWhiteSpace(" "));

        Console.WriteLine(string.IsNullOrWhiteSpace(""));

    }

}