Format currency without rounding

Question

I have the need to format a decimal number as currency but I do not wish for any rounding to occur in the process.

For example (example culture is en-US)

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Answer 1

ToString("C20") -- C takes a precision suffix

EDIT: oops, didn't read the question apparently.

.ToString("C20").Trim('0') seems like the fix, but this doesn't work when you're using string.Format...