Level of control can be added - the types of card to accept. The card type can be determined throughĪ prefix and each type has a specified length, by examining these an additional Through checking the card number using Luhn's formula, the details of whichĪre included in the next part of the article. The control includes support for validating card numbers in two ways. Which is used to specify what types of card should pass the validation using Third incarnation of the control is the AcceptedCardTypes property To the more specialised CreditCardValidator class. For those who are not familiar with UML, it showsĪ specialisation relationship between the BaseValidator and CreditCardValidatorĬlasses - an is a relationship - demonstrating inheritance from BaseValidator The diagram is missing information about parameter types since its not essential You ever wanted to know about CC's guide.īefore getting into any of the implementation details here is a simple UMLĬlass diagram to show the rough layout of the Control. Payment gateway assembly) at the following address: ,īesides this you may also be interested in the everything Incidentally, you can see a demo of the validator in use (as well as the card This is the result, a drop-in replacementįor any of the other validation controls. To include support for checking that the card number was valid before issuingĪ request to the payment gateway's server. (and received some very generous donations from CP members - thanks guys :).Īs part of this web form I wanted to include support to check that users hadĮntered a card number, expiration date etc., and then wanted to extend it further To produce a simple web form to test it out, and so opened it up for all comers Once I had got a basic version working I decided Library project (includes binary) - 10 KbĪ while ago I started working on converting an eCommerce payment gateway'sĪssembly using their XML API.
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