Julian Jelfs’ Blog

Error connecting to undo manager of source file “blah blah blah”

Posted in Visual Studio by julianjelfs on March 31, 2009

This is just a note to self really so I don’t forget the solution to this problem that I have encountered a couple of times on Visual Studio 2008. The error message is always referring to the designer file associated with an aspx or ascx file.

To solve the problem you just have to delete the designer file, then right-click the associated aspx or ascx file and choose “Convert To Web Application”. All will be well again.

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