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  • How does "ArgumentOutOfRangeException" not cover your case? It's an argument, and it's out of range. Why do you care if it's a "numeral" or not? Commented Sep 17, 2010 at 3:13
  • You're right. ArgumentOutOfRangeException definitely covers this case. I was just looking for a quick, simple example, and this was the first one that came to mind. Commented Sep 17, 2010 at 3:35