Additional information: The path is not of a legal form.

An unhandled exception of type 'System.ArgumentException' occurred in Unknown Module.

Additional information: The path is not of a legal form.

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Typically, this error from the Visual Studio 2005 Designer due to a bad (not found) reference in the project you're designing.  I found the bad reference by loading FileMon, and setup an include filter "devenv*.dll" and highlight "*NOT FOUND*".  You'll want to examined the highlighted entries, and pay special attention to your project assemblies that VS.NET cannot find.  If you resolve (or remove) the bad assembly that VS.NET cannot find, most likely, you'll be able to solve this annoying error.happy0005.gifWorked for me!