AJAX 无刷新

ICallbackEventHandler 
         
 aspx  页面：
function CallServer(PhotoId)
{
        document.getElementById("updatediv").style.display = "block";
        document.getElementById("txtPhotoID").value = PhotoId;
        var product = document.all("txtPhotoID").value;
        <%= ClientScript.GetCallbackEventReference(this, "product", "ReceiveServerData",null)%>;
}
function ReceiveServerData(PhotoInfo)
{
  if(PhotoInfo!="")
  {
   var result="";
    var str=PhotoInfo;
    var Photo=str.split("^&^");
    for(i=0;i<Photo.length;i++)
    {
      result += Photo[i];
    }
    document.getElementById("txtPhotoName").value=Photo[0];
    document.getElementById("txtPhotoDescr").value=Photo[1];
  }else{("请选择需要修改的相片！");}
}
.cs 页面
string  ICallbackEventHandler.GetCallbackResult()
    {
        return Server.UrlDecode(CallBackValue)+"^&^"+Server.UrlDecode(CallPhotoColltion);
    }
    void ICallbackEventHandler.RaiseCallbackEvent(string eventArgument)
    {
        int PhotoID = int.Parse(eventArgument);
        PhotoInfo = Photo.GetModel(PhotoID);
        string PhotoName = PhotoInfo.PhotoName;
        CallBackValue = Server.UrlDecode(PhotoName);
        string PhotoIntroduction = PhotoInfo.PhotoIntroduction;
        CallPhotoColltion = Server.UrlDecode(Phot