Watch time

   Stopwatch watch = new Stopwatch();
            watch.Start();
          
            for (int i = 0; i <= 9; i++)
            {
                for (int j = 0; j <= 9; j++)
                {
                    for (int k = 0; k <= 9; k++)
                    {
                        for (int m = 0; m <= 9; m++)
                        {
                            if (i + "" + j + "" + k + "" + m == "8549")
                            {
                                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 / 10);
                                Console.WriteLine("RunTime " + elapsedTime);
                                Console.ReadLine();
                            }
                           
                            
                        }
                    }
                }