RequiredFieldValidator not working in Firefox or on MAC

[Brian]

I have a field that is required.. If the user doesn't put anything in
that field, it throws a "Argument 'Length' must be greater or equal to
zero." error.. Is there anyway to fix this?

 

[Brian]

Nevermind.. I found the answer.. I need to put

Page.Validate()
If Page.IsValid Then

else
end if

for all my button events.. thanks anyway