Unrecognized prefix tag in my project in asp.net control

Question

I had a big problem in my project: all asp.net controls having an unrecognized tag prefix error due to the fact that all internal tags were converted to lower case, and intellisense does not work on these , but working on html controls , this project works fine on another system, but not on my system . Other projects on my system work fine.

I did the following, but could not find a solution for it:

• Remote display scheme from vs folder
• Add tag for asp control in web.config
• My system is formatted.
• Intellisense.js file added.
• Recovery done VS.

We hope for a positive decision. thanks in advance

Answer 1

Delete the folder C: \ Users \ UserName \ AppData \ Roaming \ Microsoft \ VisualStudio \ 10.0:

Visual Studio 2010 RTM intellisense not working for asp.net tags