ASP.NET 4.0-使用Jquery,如何调用codebhind函数并将数据返回给客户端?

当我单击以下div时:

 <div id="Result">Click here for the time.</div>

 <WebMethod()> _
 Public Shared Function GetDate() As String
     Return DateTime.Now.ToString()
 End Function

我需要用GetDate()函数返回的字符串填充div的内部。我认为应该使用类似的代码:

<script type="text/javascript">
    $(document).ready(function () {
        // Add the page method call as an onclick handler for the div.
        $("#Result").click(function () {
            $.ajax({
                type: "POST",
                url: "test.aspx/GetDate",
                data: "{}",
                contentType: "application/json; charset=utf-8",
                dataType: "json",
                success: function (msg) {
                    // Replace the div's content with the page method's return.
                    $("#Result").text(msg.d);
                }
            });
        });
    });
</script>

我已经从这个网站上提取了这个例子: http://encosia.com/2008/05/29/using-jquery-to-directly-call-aspnet-ajax-page-methods/

下面是当我单击div时firebug控制台告诉我的:

 POST http://admin/Default.aspx   GetDate   404 Not Found   -18ms

编辑:注意:test.aspx/GetDate必须与aspx页名和函数名匹配!