The name 'controlname' does not exist in t

Question

I have a web application that I'm working on (ASP.NET2.0 with C#, using VS2005). Everything was working fine, and all of a sudden I get the error:

Error 1 The name 'Label1' does not exist in the current context

and 43 others of the sort for each time that I used a control in my codebehind of the page.

This is only happening for 1 page. And it's as if the codebehind isn't recognizing the controls. Another interesting thing is that the intellisense isn't picking up any of the controls either..

I have tried to clean the solution file, delete the obj file, exclude the files from the project then re-add them, close VS and restart it, and even restart my computer, but none of these have worked.

Answer 1

I had a similar problem when tweaking with a Repeater after converting it from a DataList.

Problem was that I accidentally united 2 attributes when deleting an unneeded one.

<asp:Repeater runat="server" ID="ClientsRP"DataSourceID="ClientsDS">
    .
    .
    .
</asp:Repeater>

And this prevented the generation of the repeater in the design file.

Answer 2

I know this is an old question, but I had a similar problem and wanted to post my solution in case it could benefit someone else. I encountered the problem while learning to use:

• ASP.NET 3.5
• C#
• VS2008

I was trying to create an AJAX-enabled page (look into a tutorial about using the ScriptManager object if you aren't familiar with this). I tried to access the HTML elements in the page via the C# code, and I was getting an error stating the the identifier for the HTML ID value "does not exist in the current context."

To solve it, I had to do the following:

1. Run at server

To access the HTML element as a variable in the C# code, the following value must be placed in the HTML element tag in the aspx file:

runat="server"

Some objects in the Toolbox in the Visual Studio IDE do not automatically include this value when added to the page.

2. Regenerate the auto-generated C# file:

• In the Solution Explorer, under the aspx file there should be two files: *.aspx.cs and *.aspx.designer.cs. The designer file is auto-generated.
• Delete the existing *.aspx.designer.cs file. Make sure you only delete the designer file. Do not delete the other one, because it contains your C# code for the page.
• Right-click on the parent aspx file. In the pop-up menu, select Convert to Web Application.

Now the element should be accessible in the C# code file.

Answer 3

Also, make sure you have no files that accidentally try to inherit or define the same (partial) class as other files. Note that these files can seem unrelated to the files where the error actually appeared!

Answer 4

Check your code behind file name and Inherits property on the @Page directive, make sure they both match.

Answer 5

I get the same error after i made changes with my data context. But i encounter something i am unfamiliar with. I get used to publish my files manually. Normally when i do that there is no App_Code folder appears in publishing folder. Bu i started to use VS 12 publishing which directly publishes with your assistance to the web server. And then i get the error about being precompiled application. Then i delete app_code folder it worked. But then it gave me the Data Context error that you are getting. So i just deleted all the files and run the publish again with no file restrictions (every folder & file will be published) then it worked like a charm.

Answer 6

Solution option #2 offered above works for windows forms applications and not web aspx application. I got similar error in web application, I resolved this by deleting a file where I had a user control by the same name, this aspx file was actually a backup file and was not referenced anywhere in the process, but still it caused the error because the name of user control registered on the backup file was named exactly same on the aspx file which was referenced in process flow. So I deleted the backup file and built solution, build succeeded.

Hope this helps some one in similar scenario.

Vijaya Laxmi.