Best exception for an invalid generic type argument

Question

I\'m currently writing some code for UnconstrainedMelody which has generic methods to do with enums.

Now, I have a static class with a bunch of methods which are

Answer 1

I'd also vote for InvalidOperationException. I did an (incomplete) flowchart on .NET exception throwing guidelines based on Framework Design Guidelines 2nd Ed. awhile back if anyone's interested.