Formatting a negative amount with parentheses

Hello,
My negative figures are coming out with a minus sign. I would like them with parentheses.
I found this format code, but it does not work.
            e.Row.Cells(5).Text = FormatNumber(Amount3, 0, TriState.True)
Amount3 is defined as Double.
The result still shows.  -123 instead of (123).
What am I doing wrong? 
Thanks