Using the Luhn algorithm to validate credit cards

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Using the Luhn algorithm to validate credit cards(ytechie.com)

submitted by SuperJason(2740) 3 years, 9 months ago

The right way to do credit card validation with the Luhn algorithm. Just as easy as regular expressions, but with stronger validation. This is a step-by-step guide to get it working in 10 minutes or less.

4 comments |category: ASP.NET |Views: 213
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posted by powerrush(3873) 3 years, 9 months ago 0

Here is a VB.NET version of the Luhn algorithm (back when I had to code in VB.NET)...

http://www.dotnetkicks.com/vbnet/Credit_Card_Number_Validation_VB_Net_Function

posted by jdelator(500) 3 years, 9 months ago 0

Thanks for giving me credit since you the post was inspired by my comment and not the post.

posted by jdelator(500) 3 years, 9 months ago 0

It should read *since you know

posted by gregbeech(76) 3 years, 9 months ago 0

Well really the best way to do it is with both regex and Luhn validation. Also, the fastest way to add up digits in a number is to use modulus-9, not to convert to a string then walking the chars converting them as you go...

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