Error in OnSelectedIndexChanged

Dear All,

i had hidden the table and  use onselectedindexchanged to display the output, but it doesnt work, kindly advise, thank you.


<%@ Page Title="" Language="C#" MasterPageFile="~/Site.Master" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs" Inherits="acmkweb.WM.WebForm1" %> <%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="ajax" %> <asp:Content ID="Content1" ContentPlaceHolderID="HeadContent" runat="server"> </asp:Content> <asp:Content ID="Content2" ContentPlaceHolderID="MainContent" runat="server"> <asp:ScriptManager ID="ScriptManager1" AsyncPostBackTimeOut="3600" runat="server"> </asp:ScriptManager> <asp:Table ID="Table1 ...