Problem with Ajax Modal Pop Up Control in C#.net

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C#

ASP.NET

Ajax

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I have taken a button control on my page, click which the page would show a pop up window. On that popup window, there is a 'ok' button, clicking which it would redirect you to another page. I have done it with ajax modal pop up extender. It is showing the pop up window, but it's not getting redirected to the next page. please correct my code:

here is the .aspx.cs code:

<%@ Page Title="" Language="C#" AutoEventWireup="true" CodeFile="DemoAjaxModalPopUp.aspx.cs" Inherits="DemoAjaxModalPopUp" %>
<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="ajaxToolkit" %>

<asp:Content ID="Content1" ContentPlaceHolderID="head" Runat="Server">
    
    <link href="../Shopping Cart Pages/ShopStyles/StyleSheet.css" rel="stylesheet" type="text/css" />
    <script type="text/javascript">
        var styleToSelect;
        function onOk() {
            $get('Paragraph1').className = styleToSelect;
        }

        function pageLoad() {
            $addHandler($get("showModalPopupClientButton"), 'click', showModalPopupViaClient);
            $addHandler($get("hideModalPopupViaClientButton"), 'click', hideModalPopupViaClient);
        }

        function showModalPopupViaClient(ev) {
            ev.preventDefault();
            var modalPopupBehavior = $find('programmaticModalPopupBehavior');
            modalPopupBehavior.show();
        }

        function hideModalPopupViaClient(ev) {
            ev.preventDefault();
            var modalPopupBehavior = $find('programmaticModalPopupBehavior');
            modalPopupBehavior.hide();
        }

        function HideModalPopup() {
            $find("programmaticPopup").hide();
        }

        function setBodyHeightToContentHeight() {
            document.body.style.height = Math.max(document.documentElement.scrollHeight, document.body.scrollHeight) + "px";
        }
        setBodyHeightToContentHeight();
        $addHandler(window, "resize", setBodyHeightToContentHeight);    
    </script>
</asp:Content>
<asp:Content ID="Content3" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server">
<ajaxtoolkit:toolkitscriptmanager  runat="server" ID="ScriptManager1" />
<p id="Paragraph1"></p>

        <ajaxToolkit:ModalPopupExtender  runat="server" ID="programmaticModalPopup" 
                                        BehaviorID="programmaticModalPopupBehavior"
                                        TargetControlID="hiddenTargetControlForModalPopup"
                                        PopupControlID="programmaticPopup"
                                        BackgroundCssClass="modalBackground"
                                        RepositionMode="RepositionOnWindowScroll"
                                        OkControlID="OkButton"
                                        DropShadow="true"
                                        PopupDragHandleControlID="Panel3">
        </ajaxToolkit:ModalPopupExtender>

        <asp:Button runat="server" ID="hiddenTargetControlForModalPopup" Style="display: none" /> 

        <asp:Panel ID="programmaticPopup" runat="server" CssClass="modalPopup" Style="display: none; width: 350px; padding: 10px"> 
            <asp:Panel ID="Panel3" runat="server" Style="cursor: move; background-color: #DDDDDD;
                border: solid 1px Gray; color: Black">
                <div class="align_center">
                    <h3> Login Success</h3>
                    <hr />
                </div>
            </asp:Panel>
            <div class="align_center">
                <p>
                    You have successfully Logged in.
                </p>
                <p class="align_center">
                    <asp:Button ID="OkButton" runat="server" Text="OK" OnClientClick="return HideModalPopup();" OnClick="OkButton_Click" />
                </p>
            </div>
        </asp:Panel>

    <asp:Panel ID="Panel4" runat="server" CssClass="style48" Height="148px">
        <asp:Button ID="Button_Fire" runat="server" 
                        Text="Show Pop Up and then redirect to another page" CssClass="style49" 
                        Height="59px" Width="453px" onclick="Button_Fire_Click" />
    </asp:Panel>
</asp:Content>

here is the .aspx code

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

public partial class DemoAjaxModalPopUp : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }

    protected void showModalPopupServerOperatorButton_Click(object sender, EventArgs e)
    {
        this.programmaticModalPopup.Show();
    }
    protected void hideModalPopupViaServer_Click(object sender, EventArgs e)
    {
        this.programmaticModalPopup.Hide();
    }

    protected void OkButton_Click(object sender, EventArgs e)
    {
        Response.Redirect("DemoJoin.aspx");
    }
    protected void Button_Fire_Click(object sender, EventArgs e)
    {
        programmaticModalPopup.Show();
    }
}