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Visual Studio: Error Connecting to Undo Manager of Source File …

I am getting this error message from time to time stating that Visual Studio can not connect to the Undo Manager for a given source file.

There are several solutions to this problem:

  • Delete the designer file and recreate it by right-clicking on the .aspx file and chosing “Convert to Web Application”.


  • Edit the .aspx file, either by typing or dragging a control into it and then recompiling. This recreates the auto-generated designer file.

I prefer the latter because once I had problems with custom controls after deleting the designer file and trying to “convert to web application”.

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