Yesterday I was working on a page which contains Ajax Toolkit Tab Container, and there were some control on the other tab.
When i build my ASP.NET (C#) project in Visual Studio 2010, i started getting this error message
"The name 'XXXX' does not exist in the current context"
Displayed and the problem is in my .aspx page. Most surprisingly I can access the control in Intellisens but while compile time it throw error. My code definitely has no problem.
After debugging and searching for a while, i noticed that problem is cause by the back up copy of the same aspx file (copy of xxxx.aspx) that i forget to exclude from the project.
The problem solved after i exclude the file from the project.