_Default为类名称，GetServiceStatus为类中的一个方法。
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml" ><head runat="server"> <title>Untitled Page</title> <script language=Javascript>
function SetMessage()
{
_Default.GetServiceStatus(GetMessage_CallBack);
} function GetMessage_CallBack(response) { var btn = document.getElementById('<%=btnSet.ClientID%>'); var btnPanel = document.getElementById('btnPanel'); var lbl = document.getElementById('lblStatus'); var status = response.value; switch(status) { case "Running": lbl.innerText = "运行中"; btn.value = "停止"; btnPanel.style.visibility = "visible"; break; case "Stopped": lbl.innerText = "已停止"; btn.value = "启动"; btnPanel.style.visibility = "visible"; break; case "StartPending": lbl.innerText = "正在启动
"; btnPanel.style.visibility = "hidden"; break; case "StopPending": lbl.innerText = "正在停止"; btnPanel.style.visibility = "hidden"; break; } } 
</script></head><body onload="setInterval('SetMessage()',100);"> <form id="form1" runat="server"> <table> <tr><td width="250"><div id="lblStatus"></div></td><td> <div id="btnPanel" style="visibility:visible"><asp:Button ID="btnSet" runat="server" Text="Button" OnClick="btnSet_Click1" /></div></td></tr> </table> </form></body></html>.cs文件
protected void Page_Load(object sender, EventArgs e) { Ajax.Utility.RegisterTypeForAjax(typeof(_Default)); } [Ajax.AjaxMethod()] public string GetServiceStatus() { return ctl.Status.ToString(); }