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BOOK: Beginning ASP.NET 3.5 : in C# and VB BOOK ISBN: 978-0-470-18759-3
This is the forum to discuss the Wrox book Beginning ASP.NET 3.5: In C# and VB by Imar Spaanjaars; ISBN: 9780470187593
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Old April 7th, 2008, 04:19 PM
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Default Chapter 4 Pg 117 Try It Out Panel Display Question

When I followed the steps in this Try It Out example and I attempt to run this example by clicking on the check box the panel does not display as it should. I have attempted this exercise several times with the same result. I am using IE 7 and I think I have followed all of the steps correctly, however, I am new to this language.

Thank you for your help.

Here is the code from the Marked Up File

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Container.aspx.cs" Inherits="Demos_Container" %>

<!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>
    <form id="form1" runat="server">

        <asp:CheckBox ID="CheckBox1" runat="server" AutoPostBack="True"
            oncheckedchanged="CheckBox1_CheckedChanged" Text="Show Panel" />
        <br />
        <asp:Panel ID="Panel1" runat="server" style="font-weight: 700" Visible="False">
            &nbsp;&nbsp;&nbsp; I am Visible now


Code Behind File

using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;

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

    protected void CheckBox1_CheckedChanged(object sender, EventArgs e)
        Panel1.Visible = CheckBox1.Checked;
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Old April 8th, 2008, 01:06 AM
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Hi there,

Not sure what's going on. This is exactly as it should be; I copied your code in a new web form, and it works right away (as it should).

Maybe you don't have JavaScript enabled? You can check that through Tools Internet Options in IE. The configure the settings for the Zone your test web site is placed in.

Other things to check:

1. Modify the <body> tag like this:

<body onload="alert('Hello World');">

Do you see the alert message appear?

2. Check the final HTML of the page in the browser. Can you post that here? Are the controls like the checkbox converted into HTML like <input type="..." /> ?

Hope this helps,


Imar Spaanjaars
Everyone is unique, except for me.
Author of Beginning ASP.NET 3.5 : in C# and VB, ASP.NET 2.0 Instant Results and Dreamweaver MX 2004
Want to be my colleague? Then check out this post.

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