问个AJAX控件的问题

Question

 try
        {
            if (obj == null || obj.ToString().Trim().Equals(""))
            {
                content.InnerHtml = "<a href='../Login.aspx'  target='_parent'>您还没有登录,或已超时</a>";
                string str = " <script language=javascript>setTimeout(\"window.top.location.replace('../login.aspx')\",3000);</script> ";                Response.Write(str);
                return;
            }
        }
        catch (Exception ex)
        {
            Response.Redirect("../Login.asp?redirect=1");
            return;
        }
以上是在Page_Load中,因为用了UpdatePanel就不能用Response.Write();了.会弹出一个对话框.
所以我想Try一下,结果什么也捕获不到.

Answer 1

ajax不能用response.write()刷新输出的.
HttpContext.Current.Response.write(str); 

Answer 2

[Ajax.AjaxMethod
()]换为[Ajax.AjaxMethod(Ajax.HttpSessionStateRequirement.Read)]