This has been driving me crazy for months. I have a multiple projects that compile without errors. If I start copying and pasting controls (or even just plain 'p' tags) the designer will fail 1/2 the time with the error "the method or operation is not implemented". The complexity of the page doesn't matter. The 'solution' is to delete the designer file, exit visual studio, open visual studio and convert the offending aspx file to a 'web application' to regenerate the designer file.
This is a really annoying. I can't find any fixes on Google. Is there a way to disable the automatic designer file? Make it so it only generates on a 'build' command and not fail everytime I'm laying out a aspx page?
Thanks