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Home/ Questions/Q 6551319
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Editorial Team
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Editorial Team
Asked: May 25, 20262026-05-25T12:19:26+00:00 2026-05-25T12:19:26+00:00

I just converted a project from Visual Studio 2008 to 2010 and all of

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I just converted a project from Visual Studio 2008 to 2010 and all of my asp controls have a warning stating..

Unrecognized tag prefix or device filter 'asp'.

It also is not showing any intellisense, anyone else experiencing similar issues? Is it possible my conversion did not go through correctly?

Thank you.

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  1. Editorial Team
    Editorial Team
    2026-05-25T12:19:27+00:00Added an answer on May 25, 2026 at 12:19 pm

    I too was having this issue, I resolved it by deleting the C:\Users\UserName\AppData\Roaming\Microsoft\VisualStudio\10.0 folder

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