c#tips6.cs

using System;
namespace bytehide
{
  class Program
  {
    public static readonly string Url = "bytehide.com";
    static void Main(string[] args)
    {
      if (string.IsNullOrEmpty(Url))
        Console.WriteLine ("This string is null or empty.");
      else
        Console.WriteLine("This string is not null or empty.");
    }
  }
}