Thanks Rich, but where should I put this statement....I've tried it in "On No Data" and "On Error", the field still visible..For your information, actually the field is a result of 0 divided by 0. Hope to hear from you soon......Thanks in advance..
The field still visible....actually the format is "percent"....anyway I had cancelled it to try this statement...it did not work...help me some more plz.....
Its really work.....Thanks Rich, Kevin and Pat...I'm sorry if I had caused difficulties ...I'm too eager to solve my problem...I am glad I had solved it ....thanks to all of you...