c#计算代码执行时间

引用：using System.Diagnostics; 

定义：Stopwatch watch = new Stopwatch();

开始监听：watch.Start();

此处是执行的代码。。。。。

结束监听：watch.Stop();

后台提示信息：watch.ElapsedMilliseconds
//Response.Write("<Script Language=JavaScript>...alert(''+endTime-startTime +'');</Script>");
Response.Write("<script>alert('2-" + watch.ElapsedMilliseconds + "')</script>");

重新监听： watch.Restart();