跨域用ajax处理并返回处理状态

<script type="text/javascript">
        $(function () {
            $("#submitBtu").bind("click", function () { submitData(); })
        })
        function submitData() {
              var stuName = $("#stuName").val();
              var stuPhone = $("#stuPhone").val();
              if (stuName == "" || stuPhone == "") {
                  alert("请填写完整!");
                  return;
              }
              $.ajax({
                  type: "get",
                  url: "url" + new Date().getTime(),//api路径
                  data: { Name: stuName, Phonesdfd: stuPhone },
                  async: false,
                  cache: false,
                  dataType: 'jsonp',
                  jsonp: "callbackfun", //传递给请求处理程序或页面的，用以获得jsonp回调函数名的参数名(默认为:callback)
                  jsonpCallback: "jsonpCallback",
                  success: function (data) {
                      }
              });
       }
       function jsonpCallback(data) //回调函数
        {
            alert(data.rtn + "," + data.message); //
        }
    </script>

<table>
<tr><td align="left">真实姓名：</td><td align="right"><input type="text" id="stuName" value="" /></td></tr>
<tr><td align="left">电话号码：</td><td align="right"><input type="text" id="stuPhone" value="" /></td></tr>
<tr><td align="center" colspan="2"><input type="button" value="确定"  id="submitBtu"/></td></tr>
</table>

跨域代码：

public void Add(string Name, string Phonesdfd)
        {
            if (string.IsNullOrEmpty(Name) || string.IsNullOrEmpty(Phonesdfd))
            {
                Response.Write("jsonpCallback({rtn:\"0\",message:\"真实姓名和电话号码为必填项!\"})");
                return;
            }
            Regex dReg = new Regex(@"1[3|4|5|7|8]\d{9}$");//[0-9]{11,11}
            if (!dReg.IsMatch(Phonesdfd.Trim()))
            {
                Response.Write("jsonpCallback({rtn:\"0\",message:\"手机号码有误,请重新填写!\"})");
                return;
            }
            bool result = .....................................................................
            string messageStr = "";
            if (result)
            {
                messageStr = "jsonpCallback({rtn:\"1\",message:\"报名成功!\"})";
            }
            else
            {
                messageStr = "jsonpCallback({rtn:\"-1\",message:\"已经报名!\"})";
            }
            Response.Write(messageStr);
        }