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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 20th, 2013, 01:30 PM
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Question Try-it-out on p. 284 - DisplayDirection not recognized

Hi Imar,

I'm working on the Try-it-out on p.284 ("Creating Smarter User Controls") for the second time in C#. The first time I did it, the banners did not show up. On my second try, I have a new problem. I followed the directions to the letter, and VWD refuses to recognize DisplayDirection. The error keeps popping up saying "Attribute 'DisplayDirection' is not a valid attribute of element 'Banner'".

First, here is my code-behind for my Banner control:
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 Controls_Banner : System.Web.UI.UserControl
{
	public Direction DisplayDirection { get; set; }

    protected void Page_Load(object sender, EventArgs e)
    {
		  HorizontalPanel.Visible = false;
			VerticalPanel.Visible = false;

			switch (DisplayDirection)
			{
			  case Direction.Horizontal:
				  HorizontalPanel.Visible = true;
					break;
				case Direction.Vertical:
				  VerticalPanel.Visible = true;
					break;
			}
    }
}
Next, the markup for the banner control:

Code:
<%@ Control Language="C#" AutoEventWireup="true" CodeFile="Banner.ascx.cs" Inherits="Controls_Banner" %>
<asp:Panel ID="VerticalPanel" runat="server">
 <a href="http://p2p.wrox.com" target="_blank">
	<asp:Image ID="Image1" runat="server" AlternateText="This is a sample banner" 
		ImageUrl="~/Images/Banner120x240.gif" />
 </a>
</asp:Panel>

<asp:Panel ID="HorizontalPanel" runat="server">
 <a href="http://p2p.wrox.com" target="_blank">
	<asp:Image ID="Image2" runat="server" AlternateText="This is a sample banner" 
		ImageUrl="~/Images/Banner468x60.gif" />
 </a>
</asp:Panel>
Third, my Direction class:

Code:
public enum Direction
{
  Horizontal,
	Vertical
}
And last, my master file.

Code:
<%@ Master Language="C#" AutoEventWireup="true" CodeFile="Frontend.master.cs" Inherits="MasterPages_Frontend" %>

<!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></title>
  <asp:ContentPlaceHolder ID="head" runat="server">
  </asp:ContentPlaceHolder>
</head>
<body>
  <form id="form1" runat="server">
  <div id="PageWrapper">
    <div id="Header"><a id="A1" href="~/" runat="server"></a></div>
    <div id="MenuWrapper">
      <asp:Menu ID="Menu1" runat="server" CssClass="MainMenu" DataSourceID="SiteMapDataSource1" Orientation="Horizontal" StaticEnableDefaultPopOutImage="False">
      </asp:Menu>
      <asp:TreeView ID="TreeView1" runat="server" DataSourceID="SiteMapDataSource1" ShowExpandCollapse="False">
        <LevelStyles>
          <asp:TreeNodeStyle CssClass="FirstLevelMenuItems" />
        </LevelStyles>
      </asp:TreeView>
      <asp:SiteMapDataSource ID="SiteMapDataSource1" runat="server" ShowStartingNode="False" />
    </div>
    <div id="MainContent">
      <asp:SiteMapPath ID="SiteMapPath1" runat="server">
      </asp:SiteMapPath>
      <br />
      <br />
      <asp:ContentPlaceHolder ID="cpMainContent" runat="server">
      </asp:ContentPlaceHolder>
    </div>
    <div id="Sidebar">Select a Theme<br />
      <asp:DropDownList ID="ThemeList" runat="server" AutoPostBack="True" OnSelectedIndexChanged="ThemeList_SelectedIndexChanged">
        <asp:ListItem>Monochrome</asp:ListItem>
        <asp:ListItem>DarkGrey</asp:ListItem>
      </asp:DropDownList>
    	<br />
			<br />
			<Wrox:Banner ID="Banner1" runat="server" DisplayDirection="Horizontal" />
			<br />
    </div>
    <div id="Footer">Footer Goes Here</div>
  </div>
  </form>
</body>
</html>
I can't imagine why I could be getting that error. I followed everything to the letter. Any help will be greatly appreciated.

GreenhornPup
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Old March 22nd, 2013, 06:03 PM
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I looked again and again and even tried out the complete try-out twice [with the above code].
Strange but it is working over mine machine, didn't got the above error.

May be you should try to run the source code from the same chapter in order to know if there are any external problems rather then the above code.

Last edited by 07Raghav; March 23rd, 2013 at 06:41 AM..
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Old March 23rd, 2013, 06:29 PM
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I haven't seen Imar here lately. Is he on vacation?
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Old March 26th, 2013, 11:46 AM
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Did you try restarting Visual Studio? Sometimes it doesn't pick up the change and needs to be restarted for it to see the new property.

If that doesn't help, check the Errors list and make sure you don't have any other errors that prevent the site from compiling correctly.


Quote:
I haven't seen Imar here lately. Is he on vacation?
A business trip to New Orleans, but with enough fun to make it feel like a vacation ;-)

Cheers,

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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Last edited by Imar; March 26th, 2013 at 11:51 AM.. Reason: Spelling
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Old March 26th, 2013, 01:11 PM
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Quote:
Originally Posted by Imar View Post
A business trip to New Orleans, but with enough fun to make it feel like a vacation ;-)
Lucky duck
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