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BOOK: Beginning ASP.NET 4 : in C# and VB
This is the forum to discuss the Wrox book Beginning ASP.NET 4: in C# and VB by Imar Spaanjaars; ISBN: 9780470502211
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Old March 3rd, 2013, 01:59 PM
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Default Chapter 8 pg 289 Clicking Button doesn't change banner

Step 3 of page 289 states that the button click will change the banner from vertical to horizontal because the Page_Load handler will not be run so the property on the page will not be affected, which is set at horizontal. However, my banner remains vertical after clicking the button. It seems the Page_Load handler is being run when the button is clicked which I understand is supposed to be a PostBack (and not supposed to run Page_Load?)

AboutUs.aspx:
Code:
<%@ Page Title="About Us" Language="C#" MasterPageFile="~/MasterPages/Frontend.master" AutoEventWireup="true" CodeFile="AboutUs.aspx.cs" Inherits="About_AboutUs" %>

<asp:Content ID="Content1" ContentPlaceHolderID="head" Runat="Server">
    <!-- Copyright (C) 2013 -->
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="cpMainContent" Runat="Server">
    Robin P
    Skills: <br />
    <asp:Button ID="Button1" runat="server" Text="Button" />
    <br />
    <Wrox:Banner ID="Banner2" runat="server" DisplayDirection="Horizontal" />
&nbsp;
</asp:Content>
Code Behind AboutUs.aspx.cs:
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 About_AboutUs : BasePage
{
    protected void Page_Load(object sender, EventArgs e)
    {
        Banner2.DisplayDirection = Direction.Vertical;
    }
}
I am using MVS Express 2012 for Web if that makes a difference. Thanks!
Robin
 
Old March 4th, 2013, 08:57 AM
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Default

Hi there,

Looks like you missed step 1 where the code is wrapped in a !Page.IsPostBack statement.

Page_Load always fires, on the initial request as well as on a postback (for example, when a button is clicked). The check for Page.IsPostBack in Page_Load causes the direction only to be set on the initial load.

Hope this helps,

Imar
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Imar Spaanjaars
http://Imar.Spaanjaars.Com
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Author of Beginning ASP.NET 4.5 : in C# and VB, Beginning ASP.NET Web Pages with WebMatrix
and Beginning ASP.NET 4 : in C# and VB.
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RobinP2K1 (March 4th, 2013)
 
Old March 4th, 2013, 09:56 PM
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Default Silly me! Thank you.

I appreciate your quick help.
Robin





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