ASP.NET如何定时调用WebService服务

using System; using System.Collections; using System.Configuration; using System.Data; using System.Linq; using System.Web; using System.Web.Security; using System.Web.SessionState; using System.Xml.Linq;   namespace MyNet {  public class Global : System.Web.HttpApplication  {     protected void Application_Start(object sender, EventArgs e)   {    System.Timers.Timer timer1 = new System.Timers.Timer();    timer1.Interval = 30000; // 30000 毫秒 = 30秒    timer1.Elapsed += new System.Timers.ElapsedEventHandler(Time1_Elapsed);    timer1.AutoReset = true;    timer1.Enabled = true;    timer1.Start();   }     protected void Session_Start(object sender, EventArgs e)   {     }     protected void Application_BeginRequest(object sender, EventArgs e)   {     }     protected void Application_AuthenticateRequest(object sender, EventArgs e)   {     }     protected void Application_Error(object sender, EventArgs e)   {     }     protected void Session_End(object sender, EventArgs e)   {     }     protected void Application_End(object sender, EventArgs e)   {     }     void Time1_Elapsed(object source, System.Timers.ElapsedEventArgs e)   {    localhost.MyWebService ws = new localhost.MyWebService();    ws.InsertMyWebService();   }  } }