<asp:Content ID="Content1" ContentPlaceHolderID="Contentholder" Runat="Server">
<table width="100%"  border="0" align="center" cellpadding="0" cellspacing="0">
<tr>
  <td>
               <img src="images/top.jpg" width="965" height="29" border="0" usemap="#Map" />
           <td>
         <tr>
</table>
<map name="Map" id="Map">
  <area shape="rect" coords="901,4,951,25" href="List_Artcles.aspx?xx=2"  target="_blank"/>
</map>
</asp:Content>这个是传值页面if (Request.QueryString["xx"] != null && Request.QueryString["xx"].ToString().Trim().Length > 0)
        {
            string Stra = Request.QueryString["xx"].ToString().Trim();
        }这个是取值页面,但是这里的值传不过来,是NULL值,是什么方面出问题了?