Hi guys,
I'm new to ASP.net, but not new to programming. I have an issue which I can not see an easy way of fixing.
Basically I want to use the RegularExpressionValidator to validate a textbox field, but I need its ValidationExpression to differ depending on the selected item in a drop down list.
Scenario:
User selects Credit Card Type of Visa from a DDL, REV requires a 16 digit number in a card number txt field, but if they select American express from the list, REV requires only 15 digits.
I want to do this validation client side, and want to avoid using javascript where at all possible.
Hope that makes sense.
Thank you in advance!
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