c#觀察程式執行時間

System.Diagnostics.Stopwatch sw = new System.Diagnostics.Stopwatch();
sw.Reset();
sw.Start();
.......//欲觀察的程式   time1

System.Diagnostics.Debug.Print("time1:"+ sw.ElapsedMilliseconds.ToString() + "ms");//顯示 sw.Start()之後到       目前為止的時間
sw.Restart();
.....//欲觀察的程式   time2
System.Diagnostics.Debug.Print("time2:"+ sw.ElapsedMilliseconds.ToString() + "ms");
sw.Stop();