执行异步任务，并记录时间

var stopwatch = Stopwatch.StartNew();
        stopwatch.Start();

        try
        {
            DataTable dt = DbHelperSQL.Query("select CampaignCode from Test.dbo.[F2SMS04] where ISNULL(Mobile,'') != ''  group by CampaignCode").Tables[0];

            if (dt != null && dt.Rows.Count > 0)
            {
                Task[] tasks = new Task[dt.Rows.Count];

                for (int i = dt.Rows.Count - 1; i >= 0; i--)
                {
                    DataRow dataRow = dt.Rows[i];

                    string str = dataRow["CampaignCode"].ToString();
                    var task1 = Task.Factory.StartNew(() => { ShowData("F1", "[F2SMS04]", str); });
                    tasks[i] = task1;
                }
                Task.WaitAll(tasks );
            }
            //var task1 = Task.Factory.StartNew(() => { ShowData("F1", "[F2SMS04]"); });
            //var task2 = Task.Factory.StartNew(() => { ShowData("F2", "[27F2Y1983]"); });
            //var task3 = Task.Factory.StartNew(() => { ShowData("F3", "[33F3N1850]"); });
            //Task.WaitAll(new[] { task1 });
            gvResult.DataSource = dtShow;
            gvResult.DataBind();
        }
        catch (Exception ex)
        {
            Response.Write("任务异常：" + ex.Message + "<br/>");
        }

        // cde.Wait();
        stopwatch.Stop();
        lblTip.Text = "ShortUrl生成成功" + "生成时间：" + stopwatch.ElapsedMilliseconds;