I'm sorry, but I'm having trouble understanding the problem as you've stated
it here. You say you want something "like IP address text box" but
apparently it is NOT an IP address, as an IP address is 4 numbers separated
by periods. In any case, if you want, for example, 3 boxes with numbers in
them that will be concatenated together somehow, your only requirement is to
check each box for a number. If your requirement is more specific, you can
set a range of valid numbers. And as for combining them, well, the sum of
the parts will make up the whole. If all 3 boxes validate, then you don't
have to check again to make sure that the combination is valid.
I must be missing something.
--
HTH,
Kevin Spencer
Microsoft MVP
..Net Developer
What You Seek Is What You Get.