vb code for macro to not execute when blank cell encountered.

Hi
in C9 user enters a customer number e.g. 124578 (mandatory must enter number)

then in C10 user enters a date 16/3/2010 (mandatory must enter date)


and from H20:H200 the user fails to enter required qty e.g. 2,5 or 100.

(mandatory, user must enter quantity in atleast one cell between this range).

and runs a macro

when this happens the macro must fail.

I want to stop the macro from being executed if all above 3 criterias are not fulfilled.

Can you please advise asap
Many thanks

what is the difference between this question and your previous one?

the difference is after i modified the code i found that i had to enter a value in all rows in the h column until 200. what i want is in that range H20 to H200 even if i enter one value in either one of the rows then that is acceptable.
have attached a mock file with code for your reference.
thanks again.

vb Code:

dim notallempty as boolean, c as range
for each c in range("o3:0333")
  if not isempty(c) then notallempty = true: exit for
next
if not isempty(range("c9")) and not isempty(range("c10") and notallempty then
else 
  exit sub
end if

change ranges to suit, i didn't test, but looks right

thank but it's falling off at no. 5 ( the code is appearing in red) and am trying to check why but so far cudn't figure it out.

needs extra closing bracket after c10"