StopWatch In C# จะเอา output ออกมาได้ยังไงหรอคับ ผมมือไหม่มากก

TimeSpan tt = stopWatch.Elapsed;
 string gettimeuse = string.Format("{0:00}:{1:00}:{2:00}.{3:00}", tt.Hours, tt.Minutes, tt.Seconds, tt.Milliseconds / 10);

using System;
using System.Diagnostics;
using System.Threading;

class Program
{
    static void Main()
    {
	// Create new stopwatch
	Stopwatch stopwatch = new Stopwatch();

	// Begin timing
	stopwatch.Start();

	// Do something
	for (int i = 0; i < 1000; i++)
	{
	    Thread.Sleep(1);
	}

	// Stop timing
	stopwatch.Stop();

	// Write result
	Console.WriteLine("Time elapsed: {0}",
	    stopwatch.Elapsed);
    }
}