Watch time

    Stopwatch watch = new Stopwatch();
             watch.Start();

             for (int i = ; i <= ; i++)
             {
                 for (int j = ; j <= ; j++)
                 {
                     for (int k = ; k <= ; k++)
                     {
                         for (int m = ; m <= ; m++)
                         {
                             if (i + "" + j + "" + k + "" + m == "")
                             {
                                 watch.Stop();

                                 // Get the elapsed time as a TimeSpan value.
                                 TimeSpan ts = watch.Elapsed;

                                 // Format and display the TimeSpan value.
                                 string elapsedTime = String.Format("{0:00}:{1:00}:{2:00}.{3:00}",
                                     ts.Hours, ts.Minutes, ts.Seconds,
                                     ts.Milliseconds / );
                                 Console.WriteLine("RunTime " + elapsedTime);
                                 Console.ReadLine();
                             }

                         }
                     }
                 }