static void Main() { int i = 2, j = 3; System.Console.WriteLine("i = {0} j = {1}" , i, j); SwapByRef (ref i, ref j); System.Console.WriteLine("i = {0} j = {1}" , i, j); // Keep the console window open in debug mode. System.Console.WriteLine("Press any key to exit."); System.Console.ReadKey(); } /* Output: i = 2 j = 3 i = 3 j = 2 */