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<%@ Page Language="C#" MasterPageFile="~/Main.Master" AutoEventWireup="true" CodeBehind="Menu.aspx.cs" Inherits="UserPanel.Menu" Title="Untitled Page" %>

<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="asp" %>

<asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1" runat="server">
<style type="text/css">
        background-color: Black;
        filter: alpha(opacity=90);
        opacity: 0.8;
        background-color: #FFFFFF;
        border-width: 3px;
        border-style: solid;
        border-color: black;
        padding-top: 10px;
        padding-left: 10px;
        width: 300px;
        height: 140px;

  <asp:ScriptManager ID="ScriptManager1" runat="server"/>	          
                <div class="row">
                    <div class="col-md-12">
                        <h1 class="page-head-line">Menu</h1>
                        <h1 class="page-subhead-line">Select Your Menu !</h1>

                <!-- /. ROW  -->
                <div class="row">
               <div class="panel panel-info">
                        <div class="panel-heading">
                           *You Can Place On Order at a Time !
                        <div align="center">
<asp:LinkButton ID="LB_Sheesha"  runat="server">Order Normal Shesha <br />
 <asp:LinkButton ID="LB_Special" runat="server">Order Special Shesha
    <asp:Panel ID="Panel1" runat="server" visible=false  >
          <asp:Label ID="Label1" runat="server" Text="Label"> Select Flavour
          <asp:DropDownList ID="Drop_nsheesha" runat="server">
    <asp:Button ID="B_Next" class="btn btn-info" runat="server" Text="Next" />
   <asp:Button ID="B_Cancel" class="btn btn-info" runat="server" Text="Cancel" /> 
    <asp:ModalPopupExtender ID="ModalPopupExtender2" runat="server"
      TargetControlID="LB_Sheesha" PopupControlID="Panel1" DropShadow="true" 
        OkControlID="B_Next"  CancelControlID = "B_Cancel" 
        OnOkScript="onOK()" BackgroundCssClass="modalBackground" 
        oncancelscript="Are You Sure ? " 
Updated 26-Oct-14 12:47pm
Praveen_P 27-Oct-14 0:07am
Try using Toolkit Script Manger instead of ScriptManager

change "Panel1" visible=false to style="display: none"

refer below article:
ASP.NET AJAX Control Toolkit ModalPopupExtender Control in Action[^]
1.The tagprefix used by you in "@Register" directive should not be "asp", because "asp" is reserved for system ASPX controls.

2.It seems that you forgot to provide all ASPX code, because your "ModalPopupExtender" control is not closed properly.

3.You can find example about the correct using of the Modal Popup Extender in my next article: Advanced ASPX GridView Pagination and Data Entities[^]

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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