Why won't the lable update

**Stevesl** · Nov 1 '10, 06:42 PM

Simply, the lblDebug field will not update when it is assigned a value in the code behind. Why?

-- aspx file --

Code:

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

<!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 id="Head1" runat="server">
    <title>Vendor Code</title>
    <script type="text/javascript" language="javascript">
        var ModalProgress = '<%= ModalProgress.ClientID %>';
    </script>
</head>
<body>
    <form id="form" runat="server">
    <div style="height: 305px">
    <table width="1024px;">
        <tr>
            <td align="center" valign="top">
                <h1 style="text-align: center; padding-top: 25px;">
                    Vendor Code
                </h1>

                <script type="text/javascript" src="jsUpdateProgress.js"></script>		
                <div id="ParentDiv" style="display:block; width: 800px; z-index:1">
                    <ajax:ToolkitScriptManager runat="server" ID="upLabelsScriptManager" EnablePageMethods="true" />
                    <asp:Panel ID="panelUpdateProgress" runat="server" CssClass="updateProgress">     
                        <asp:UpdateProgress ID="UpdateProg1" DisplayAfter="0" runat="server">       
                            <ProgressTemplate>         
                                <div style="position: relative; top: 30%; text-align: center;">           
                                    <img src="http://bytes.com/images/progressBar.gif" style="vertical-align: middle" alt="Processing" width="82" height="10" />
                                    <br />
                                    Loading . . .        
                                </div>
                            </ProgressTemplate>
                        </asp:UpdateProgress>
                    </asp:Panel> 
                    <ajax:ModalPopupExtender runat="server" id="ModalProgress" backgroundcssclass="modalBackground" targetcontrolid="panelUpdateProgress" popupcontrolid="panelUpdateProgress" />

                    <asp:UpdatePanel runat="server" ID="upLabels" EnableViewState="true">
                        <ContentTemplate>
                            <table width="565px">
                                <tr>
                                    <td style="padding-top: 20px; text-align: center;" >
                                    </td>
                                </tr>
                                <tr>
                                    <td>
                                        <asp:Panel runat="server" ID="pnlCode">
                                            <table>
                                                <tr>
                                                    <td>
                                                    Code: 
                                                    <asp:TextBox ID="txtCode" runat="server" />&nbsp;&nbsp;
                                                    <asp:Button ID="btnCodeSubmit" runat="server" Text="Submit" />
                                                    </td>
                                                </tr>
                                            </table>
                                        </asp:Panel>
                                        <asp:Panel runat="server" ID="pnlEdit">
                                            action page
                                        </asp:Panel>
                                    </td>
                                </tr>
                            </table>
                        </ContentTemplate>
                    </asp:UpdatePanel>
                </div>
            </td>
        </tr>
    </table>
    </div>
    <asp:Label ID="lblDebug" runat="server" Text="" />
    </form>
</html>

-- end of aspx file ---

-- code behind ---

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 Vendor820sAcctNos : System.Web.UI.Page
{




    protected void Page_Load(object sender, EventArgs e)
    {

        lblDebug.Text = "";

        if (IsPostBack)
        {
            if (Session.SessionID.ToString() == Session["SessionID"].ToString())
            {
                if (txtCode.Text == "abc123")
                {
                    lblDebug.Text = "IS-PostBack: good";
                    pnlCode.Visible = false;
                    pnlEdit.Visible = true;
                }
                else
                {
                    lblDebug.Text = "IS-PostBack: bad";
                    pnlCode.Visible = true;
                    pnlEdit.Visible = false;
                }
            }
            else
            {
                lblDebug.Text = "IS-PostBack: SessionId bad";
                pnlCode.Visible = true;
                pnlEdit.Visible = false;
            }
        }
        else
        {
            Session["SessionID"] = Session.SessionID.ToString();
            Session["Code"] = "";
            lblDebug.Text = "PageLoad";
            pnlCode.Visible = true;
            pnlEdit.Visible = false;
        }
    }

}

-- end of code behind --