<div id="loadinfo" style="visibility:hidden; Z-INDEX: 12000; LEFT: 0px; WIDTH: 100%; CURSOR: wait; POSITION: absolute; TOP: 0px; HEIGHT: 100%"> 
            <table width="100%" height="100%"> 
                <tr align="center" valign="middle"> 
                    <td> 
                        <table width="169" height="62" bgcolor="#99cccc" style="FILTER: Alpha(Opacity=75); WIDTH: 169px; HEIGHT: 62px"> 
                            <tr align="center" valign="middle"> 
                                <td>页面提交中.<br/> 
                                     Loading....</td> 
                            </tr> 
                        </table> 
                    </td> 
                </tr> 
            </table> 
        </div>
    
        <input id="Button1" type="button" value="Get ServerTime" onclick ="javascript:GetTime();void(0)" />

 // loading效果
        AjaxPro.onLoading = function(b) 
        {
            var a = document.getElementById("loadinfo");
            a.style.visibility = b ? "visible" : "hidden";
        }
 
        function GetTime() 
        {
            // 调用服务端方法
            //调用方法:类名.方法名 (参数为指定一个回调函数)
            _Default.GetServerTime();
        }

 [AjaxPro.AjaxMethod] //申明是ajaxPro方法
    public void GetServerTime()
    {
        System.Threading.Thread.Sleep(2000);
        return DateTime.Now.ToString();
    }