求教一个ASP框架集刷新的问题

主页面:<
      frameset cols ="20%,80%"> 
      <frame name="left" id="left" src="left.aspx"> 
      <frame name="I3" id="I3" src="easting.aspx"> 
      </frameset>
想要实现点击 left页面的数据 刷新 I3页面的数据，求各位大师们指教，或者有什么好用的方法指教一二，拜谢 
left页面:前台 
JS  
  <script type="text/javascript">
    function show_example() {
         //window.parent.document.getElementById("I3").src="easting.aspx";
         window.parent.frames["I3"].location.reload();
  </script>数据控件
                              <asp:ListView ID="LV_Menu" runat="server"  ItemContainerID= "ItemPlaceHolder" 
                                      onitemcommand="LV_Menu_ItemCommand" 
                                      onselectedindexchanged="LV_Menu_SelectedIndexChanged"
                                      >
                               <LayoutTemplate>
                               <table border="2">
                               <tbody>
                               <asp:PlaceHolder  runat ="server" ID="ItemPlaceHolder"></asp:PlaceHolder>
                               </tbody>
                               </table>
                               </LayoutTemplate>
        
                               <ItemTemplate>
                               
                               <tr>
                               <td id='submenu2'>
                               <asp:LinkButton ID="LB" runat="server" Text='<%# Eval("地区")%>'/>
                               </td>
                               </tr>
                               </ItemTemplate>
                               </asp:ListView>
后台：
    protected void LV_Menu_ItemCommand(object sender, ListViewCommandEventArgs e)
    {
            ListViewDataItem dataItem = (ListViewDataItem)e.Item;
            LinkButton Mylikebutton;
            Mylikebutton = (LinkButton)e.Item.FindControl("LB");
            //string strUrl = "easting.aspx?UserName=" + Mylikebutton.Text.Trim();
            //Response.Redirect(strUrl);
            //Server.Transfer(strUrl,true);
            Session["UserName"] = Mylikebutton.Text.Trim();
            Page.ClientScript.RegisterStartupScript(this.GetType(), "text", "function show_example()", true);
     }
I3页面：后台
  protected void Page_Load(object sender, EventArgs e)
    {
        string area ;
                if (!Page.IsPostBack)
        {
            area = "上海";
        }
        else
        {
            area = Session["UserName"].ToString();
         }
        BindGrid1(area);
    }