Reference disappear upon debug/build (C#, VB.NET, VS2010)?

Check that you are using the . Net 4 framework and not the client profile version.

I ran into a very similar issue once. In my case the problem turned out to be a missing dependency for the "vanishing" namespace's assembly. What finally gave me the information I needed was the suggestion in this StackOverflow answer to raise the MSBuild output verbosity level.

After raising the verbosity setting the IDE should give you a more specific reason why the compilation fails.

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