how to validate a numeric field?

Question

I need to validate a field which is numeric. Can anyone point me in the right direction? I am really new to programming and do not know how to go about crreating a method or furnction to validate a textbox field every time a user enters data into it. Thanks in advance, Lee

Answer 1

Do some readings on regions and invalidating and clipping regions. You certainly don't want to load every thing on the form if you only need a small portion of the form to be rendered.