Visual Studio 2008 Error List showing spurious errors

Posted on 2009-02-09
Medium Priority
Last Modified: 2013-12-17
My Visual Studio (developing asp.net applications) error list constantly shows hundreds of errors, even though there are actually none within the site. The errors are all of exactly the same type: 'The name xxx does not exist in the current context'. xxx refers to a server side control declaratively defined.  It seems like VS is checking the code behind files but isn't checking the declarative files when doing its checks.
The app builds without issue.

It's not killer, but it is annoying and makes it difficult to find genuine errors. I've applied all service packs and updates. Anyone encountered this and know how to fix it?
Question by:NazoUK
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LVL 53

Expert Comment

ID: 23598019
Found at another forum:  found out the that problem is cause by the back up copy from the same file (copy of default.aspx) that i forget to exclude from the project. The problem solved after i exclude the file from the project.

LVL 53

Expert Comment

ID: 23598020
In your code behind you must create the member as well. When you drag/drop a control on you Layout View VS will generate this for you; otherwise you have to do it yourself. It isn't that hard:

public class MyWebPage : System.Web.UI.Page
     protected System.Web.UI.WebControls.Panel pnlDescription;
     // ...
LVL 15

Author Comment

ID: 23620888

Thanks for the response but I've checked my project and there aren't any backup files in there.
Also, I've never heard of having to declare server controls in the code-behind as well and never seen it done in any of the books, blogs, articles etc I've read so I'm not convinced about that. Also I tested in VS layout view and it didn't automatically add anything.
LVL 15

Accepted Solution

NazoUK earned 0 total points
ID: 23815507
Turns out the problem is caused by a bug in Visual Studio SP 1.
Detailed information and a Hotfix can be found at


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