Visual Web Developer 2012 Express. Windows 7.
When in the editor, in split mode, I notice that all of my asp: prefixed controls have the asp: underlined in green and give the error "Unrecognized tag prefix or device filter 'asp.'" Most of my other pages do not show this error when in the editor. The page in question runs fine. What might cause this and how can I fix it!? Thanks for the help.