Gridview not displaying in Panel associated with a ModalPopupExtender - asp.net

Question

I have two imagebuttons which are associated with a modalpopupextender. When I click imagebutton1, it opens up the panel and within that panel there is a grid which loads with the information. However, when I click Imagebutton2 it opens up the panel but does not display the gridview even though that gridview tag is under that panel.
I am pretty new with web, please help. Thank You. Please find the code below:
<asp:Panel ID="PNL" ScrollBars="Auto" runat="server" Style="border: 2px solid Black; display: none; width: auto;
background-color: White; padding: 20px; text-align: center;" Height="444">
<asp:Label ID="LabelCount" runat="server" Text="Label" Font-Size="Large"
style="text-align: center"></asp:Label>
<asp:Button ID="ButtonOK" Text="OK" runat="server" />
<%-- Area for keeping POPUP grid ot window or picture DO NOT PUT UNDER TABLE Taj 3-Jan-2010--%>
<asp:GridView ID="gvUsersWHYME" runat="server" BackColor="White" BorderColor="#010101"
BorderStyle="None" CaptionAlign="Top" CellPadding="1" CellSpacing="2" GridLines="None"
Style="margin-left: 0px" DataSourceID="SqlDataSource0" AutoGenerateColumns="False"
EnableTheming="False" AllowSorting="True"
OnRowDataBound="gvUsers_RowDataBound">
<Columns>
<asp:TemplateField HeaderText="Roles" Visible="False">
<HeaderTemplate>
<asp:CheckBox ID="chkAll" runat="server"
onclick="javascript:SelectAllCheckboxesSpecific(this);" />
</HeaderTemplate>
<ItemTemplate>
<asp:CheckBox ID="chkGenerate" runat="server"
onclick="javascript:HighlightRow(this);" />
</ItemTemplate>
</asp:TemplateField>
<asp:BoundField DataField="ProjectNum" HeaderText="Release#" SortExpression="ProjectNum"
ReadOnly="true" />
<asp:BoundField DataField="IPMRefNum" HeaderText="IPM Ref #"
SortExpression="IPMRefNum" />
<asp:BoundField DataField="TestprojectNo" HeaderText="Release Description" SortExpression="TestprojectNo"
ItemStyle-Width="444">
<ItemStyle Width="444px"></ItemStyle>
</asp:BoundField>
<asp:BoundField DataField="ProjectName" HeaderText="ProjectName" SortExpression="ProjectName"
Visible="False" />
<asp:BoundField DataField="ProposedPhaseName" HeaderText="Proposed Phase Name" ItemStyle-Wrap="False"
SortExpression="ProposedPhaseName">
<ItemStyle Wrap="False"></ItemStyle>
</asp:BoundField>
<asp:BoundField DataField="DependencyList" HeaderText="Dependency List"
SortExpression="DependencyList" />
<asp:BoundField DataField="QA_Planned_EndDate" HeaderText="Release Handover Date"
SortExpression="QA_Planned_EndDate" DataFormatString="{0:d}"
ItemStyle-Wrap="False">
<ItemStyle Wrap="False"></ItemStyle>
</asp:BoundField>
<asp:BoundField DataField="Applications" HeaderText="Impacted Application(s)"
SortExpression="Applications" />
<asp:BoundField DataField="AppCount" HeaderText="Count"
SortExpression="AppCount" />
</Columns>
<FooterStyle BackColor="White" ForeColor="#330099" />
<RowStyle BackColor="White" ForeColor="#330099" />
<HeaderStyle BackColor="#ACCDF6" Font-Bold="True" ForeColor="#FFFFCC" />
</asp:GridView>
<asp:Label ID="lblCountImpacted" runat="server" Text="Total Impacted App."
Font-Size="Large"></asp:Label>
</asp:Panel>
<br />
<br />
<br />
<br />
<br />
<asp:Panel ID="Panel1" ScrollBars="Auto" runat="server" Style="border: 2px solid Black; display: none; width: auto;
background-color: White; padding: 20px; text-align: center;" Height="444">
<asp:Button ID="Button1" Text="OK" runat="server" />
<asp:GridView ID="GridView4" runat="server" BackColor="White" BorderColor="#010101"
BorderStyle="None" CaptionAlign="Top" CellPadding="1" CellSpacing="2" GridLines="None"
Style="margin-left: 0px" DataSourceID="SqlDataSource6" AutoGenerateColumns="False"
EnableTheming="False" AllowSorting="True"
OnRowDataBound="GridView4_RowDataBound">
<Columns>
<asp:BoundField DataField="ProjectNum" HeaderText="Release#" SortExpression="ProjectNum"
ReadOnly="true" />
<asp:BoundField DataField="IPMRefNum" HeaderText="IPM Ref #"
SortExpression="IPMRefNum" />
<asp:BoundField DataField="TestprojectNo" HeaderText="Release Description" SortExpression="TestprojectNo"
ItemStyle-Width="444">
<ItemStyle Width="444px"></ItemStyle>
</asp:BoundField>
<asp:BoundField DataField="ProjectName" HeaderText="ProjectName" SortExpression="ProjectName"
Visible="False" />
<asp:BoundField DataField="ProposedPhaseName" HeaderText="Proposed Phase Name" ItemStyle-Wrap="False"
SortExpression="ProposedPhaseName">
<ItemStyle Wrap="False"></ItemStyle>
</asp:BoundField>
<asp:BoundField DataField="DependencyList" HeaderText="Dependency List"
SortExpression="DependencyList" />
<asp:BoundField DataField="QA_Planned_EndDate" HeaderText="Release Handover Date"
SortExpression="QA_Planned_EndDate" DataFormatString="{0:d}"
ItemStyle-Wrap="False">
<ItemStyle Wrap="False"></ItemStyle>
</asp:BoundField>
</Columns>
<FooterStyle BackColor="White" ForeColor="#330099" />
<RowStyle BackColor="White" ForeColor="#330099" />
<HeaderStyle BackColor="#ACCDF6" Font-Bold="True" ForeColor="#FFFFCC" />
</asp:GridView>
</asp:Panel>

Answer 1

I have created a sample code.Similar to your problem.
<%# Page Language="C#" AutoEventWireup="true" CodeFile="MasterDetail.aspx.cs"
Inherits="MasterDetail" %>
<%# Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="ajaxtoolkit" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>Untitled Page</title>
</head>
<body>
<form id="form" runat="server">
<asp:ScriptManager ID="scriptManager" runat="server" />
<div>
<asp:UpdatePanel ID="updatePanel" runat="server" UpdateMode="Conditional">
<ContentTemplate>
<asp:Label ID="lblTitle" runat="server" Text="Customers" BackColor="lightblue" Width="95%" />
<asp:GridView ID="gvCustomers" runat="server" DataKeyNames="Id" AutoGenerateColumns="false"
AllowPaging="true" AllowSorting="true" PageSize="10" Width="95%">
<AlternatingRowStyle BackColor="aliceBlue" />
<HeaderStyle HorizontalAlign="Left" />
<Columns>
<asp:TemplateField ControlStyle-Width="50px" HeaderStyle-Width="60px">
<ItemTemplate>
<asp:Button ID="btnViewDetails" runat="server" Text="Details" OnClick="BtnViewDetails_Click" />
</ItemTemplate>
</asp:TemplateField>
<asp:BoundField DataField="Id" HeaderText="ID" SortExpression="Id" ReadOnly="true" />
<asp:BoundField DataField="Name" HeaderText="Name" SortExpression="contactname" ReadOnly="true" />
</Columns>
</asp:GridView>
</ContentTemplate>
</asp:UpdatePanel>
<asp:Button ID="btnShowPopup" runat="server" Style="display: none" />
<ajaxtoolkit:ModalPopupExtender ID="mdlPopup" runat="server" TargetControlID="btnShowPopup"
PopupControlID="pnlPopup" CancelControlID="btnClose" BackgroundCssClass="modalBackground" />
<asp:Panel ID="pnlPopup" runat="server" Width="500px" Style="display: none">
<asp:UpdatePanel ID="updPnlCustomerDetail" runat="server" UpdateMode="Conditional">
<ContentTemplate>
<asp:Label ID="lblCustomerDetail" runat="server" Text="Customer Detail" BackColor="lightblue"
Width="95%" />
<asp:DetailsView ID="dvCustomerDetail" runat="server" DefaultMode="Edit" Width="95%"
BackColor="white" />
</ContentTemplate>
</asp:UpdatePanel>
<div align="right" style="width: 95%">
<asp:Button ID="btnSave" runat="server" Text="Save"
OnClientClick="alert('Sorry, but I didnt implement save '); return false;"
Width="50px" />
<asp:Button ID="btnClose" runat="server" Text="Close" Width="50px" />
</div>
</asp:Panel>
</div>
</form>
</body>
</html>
using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
public partial class MasterDetail : System.Web.UI.Page
{
DataSet ds;
protected void Page_Load(object sender, EventArgs e)
{
ds = Data();
if (!this.IsPostBack)
{
if (Session["parent"] == null)
{
gvCustomers.DataSource = ds.Tables["Parent"];
gvCustomers.DataBind();
}
else
{
gvCustomers.DataSource = Session["Parent"] as DataTable;
gvCustomers.DataBind();
}
}
}
private DataSet Data()
{
DataTable dt = new DataTable();
dt.Columns.Add("Id", typeof(int));
dt.Columns.Add("Name", typeof(string));
dt.Rows.Add(new object[] { 1, "aaaa" });
dt.Rows.Add(new object[] { 2, "bbbb" });
dt.Rows.Add(new object[] { 3, "cccc" });
dt.TableName = "Parent";
DataTable dtc = new DataTable();
dtc.Columns.Add("Id", typeof(int));
dtc.Columns.Add("Qul", typeof(string));
dtc.Rows.Add(new object[] { 1, "aaaa" });
dtc.Rows.Add(new object[] { 2, "bbbb" });
dtc.Rows.Add(new object[] { 3, "bbbb" });
dtc.TableName = "Child";
DataSet ds = new DataSet();
ds.Tables.Add(dt);
ds.Tables.Add(dtc);
Session["Parent"] = dt;
return ds;
}
protected void BtnViewDetails_Click(object sender, EventArgs e)
{
// get the gridviewrow from the sender so we can get the datakey we need
Button btnDetails = sender as Button;
GridViewRow row = (GridViewRow)btnDetails.NamingContainer;
// extract the id from the row whose details button originated the postback.
// grab the customerid and feed it to the customer details datasource
// finally, rebind the detailview
DataView dv = new DataView(ds.Tables["Child"]);
dv.RowFilter = "Id=" + Convert.ToString(this.gvCustomers.DataKeys[row.RowIndex].Value);
dvCustomerDetail.DataSource = dv;
dvCustomerDetail.DataBind();
// update the contents in the detail panel
this.updPnlCustomerDetail.Update();
// show the modal popup
this.mdlPopup.Show();
}
}