Error connecting to undo manager of source file
I’ve been getting this error in VS2008 for a day or so now. It wasn’t breaking but it was annoying. I finally found a moment to track down a fix and turned up this gem by CoolBond in asp.net forums.
1) Right-click the designer file and select delete
2) Right-click the aspx file and select Convert to Web Application
worked like a charm. Thanks CoolBond.