Freude im Dev-Team :-)

gistfile1.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication2
{
    class Program
    {
        static Program() { typeof(string).GetField("Empty").SetValue(null, "HaaaHa"); }

        static void Main(string[] args)
        {
            var foo = String.Empty;
            Console.WriteLine(foo);
            Console.ReadLine();
        }
    }
}