I've searched and maybe I'm not using the right keywords. This seems like a simple question.

I'm working with very large integers and I'm using the Codeplex class IntX. When I get a very large integer, I want to be able to determine the size in bytes.

I can't seem to find anything that works...

The sizeof operator will give me the size of the type, but that's not what I'm after. I need the size of the data in the variable.