asp.net 通过Global.asax 定时执行web应用中的的程序

 protected void Application_Start(object sender, EventArgs e)
        {
            System.Timers.Timer t = new System.Timers.Timer(3000000); //差不多办小时一次，比如10秒，就写10000
             t.Enabled = true;
             t.Elapsed += new System.Timers.ElapsedEventHandler(Interval);
            t.Start();
        }
        void Interval(object sender, System.Timers.ElapsedEventArgs e)
        {
            //添加自己的代码
                    OA.BLL.Duty bll = new OA.BLL.Duty();
                    bll.SetDuty();
                   

           
        }