asp.net判断页面加载所用时间_[Asp.Net教程]

DateTime dt;
protected override void OnPreInit(EventArgs e)
{
dt = DateTime.Now;
base.OnPreInit(e);
}
public override void RenderControl(HtmlTextWriter writer)
{
base.RenderControl(writer);
TimeSpan ts = DateTime.Now - dt;
Response.Write("加载页面用时：" + ts.TotalMilliseconds);
}