关于C#timer类出错

using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using System.Threading;

public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
System.Timers.Timer time = new System.Timers.Timer();
time.Interval = 1000;
time.Elapsed += new System.Timers.ElapsedEventHandler(time_Elapsed);
time.AutoReset = true;
time.Enabled = true;

}

public void time_Elapsed(object sender, System.Timers.ElapsedEventArgs e)
{

Label1.Text = "哈哈哈哈哈";
throw new NotImple

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