I would like to put in a verification check in a form, however I can't seem to figure out how to get it to work. I have a field entitled "PaymentType" and a field entitled "CheckNumber". PaymentType is a drop-down list. One of the PaymentType options is "Check". I would like to make it such that if the user selects the PaymentType of "Check" the form requires the user to input a CheckNumber. I've played around with IIF statments, but they don't seem to be working right. Help? Please?