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(); 
 } 
 } 
}