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BOOK: Beginning ASP.NET 3.5 : in C# and VB BOOK ISBN: 978-0-470-18759-3
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Old June 25th, 2008, 06:26 PM
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Default Chapter 8 in VB.NET page 283

After I make the changes to the Page_Load procedure, then compile/run the website default.aspx, I get this error,

"Name 'Banner1' is not declared".

It says on the bottom part of the page to "verify that the banner user control has an ID of Banner1 in the mark-up view of the page", so I checked the MasterPage.master and this is the line that references the user control:

<Wrox:Banner ID="Banner1" runat="server" DisplayDirection = "Vertical" />

I don't know why I'm getting an error, any suggestion?

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Old June 26th, 2008, 02:30 AM
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Hi jensam,

Maybe you missed a few steps? The idea is to write this code in About.aspx, not in the Master Page.

Step 11 on page 282 shows you how to add a Banner control to the About page, resulting in the markup you posted here (<Wrox:Banner ID="Banner1" ...)

Step 1 on page 283 then says: "Open the Code Behind of AboutUs.aspx and add the following code.

So, the code in the Page_Load of AboutUs.aspx.vb talks to the control defined in the markup of AboutUs.aspx. The Master Page shouldn't have anything to do with it in this demo.

Hope this helps,


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Old August 18th, 2008, 05:08 AM
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Hello jensam

I also missed the step 11 on page 282, after adding the banner.ascx control into the aboutus.aspx i got the problem solved.

But i am curious already there is a banner control in master page with id "Banner1" and now another banner control in the aboutus.aspx page with the banner id "Banner1". Won't there be a conflict when the page loads with both master and aboutus.aspx with these banner id's.


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Old August 19th, 2008, 08:02 AM
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In the .NET framework, there are two "TextBox" classes:


They don't conflict because they are in two different namespaces. Think of your question in that regard. Yes, you have a "Banner1" in two places however, they are in different places in a control hierarchy. One is in the master page's controls and one in the page's content placeholder. If you look at the HTML that is emitted to the browser for the aboutus.aspx page, you'll see two distinct controls names:

ctl00_cpMainContent_Banner1 - This is the horizontal banner in the page's content.
ctl00_Banner1 - This is the one that lives in the master page.

Note: Unless explicitly named, the top level master page control will typically be "ctl00".

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