看看你的代码用了几毫秒，几秒，几分，几小时。

 

 //System.Diagnostics.Stopwatch watcher = new System.Diagnostics.Stopwatch();
 //watcher.Start();

            System.Diagnostics.Stopwatch watcher = System.Diagnostics.Stopwatch.StartNew();
            Thread.Sleep(2500); //do some thing
            watcher.Stop();
            MessageBox.Show(watcher.Elapsed.TotalMilliseconds.ToString());
            MessageBox.Show(watcher.Elapsed.TotalSeconds.ToString());
            MessageBox.Show(watcher.Elapsed.TotalMinutes.ToString());
            MessageBox.Show(watcher.Elapsed.TotalHours.ToString());