public static void Main()
    {
        RefTest rt1 = new RefTest();
        RefTest rt2 = new RefTest();

        rt1.Value = 1;
        rt2.Value = 2;
        Console.WriteLine("rt1.Value = " + rt1.ToString());
        Console.WriteLine("rt2.Value = " + rt2.ToString());

        rt1       = rt2;
        rt1.Value = 3;

        Console.WriteLine("rt1.Value = " + rt1.ToString());
        Console.WriteLine("rt2.Value = " + rt2.ToString());
    }