What is the code for Credit card no. validation in C#?

[Pete OHanlon]

You like point 3 so much, you make it twice. :-D

I'm not a stalker, I just know things. Oh by the way, you're out of milk.

Forgive your enemies - it messes with their heads

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[Keith Barrow]

In an embarring faux pas, I also get it wrong the second time :-) I shall use <ol> next time, unless I'm being lazy. Oh BTW, I'm not coming home over the festive, that's why I haven't been in touch. We are planning a visit mid-Jan instead.

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-Or-
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[Pete OHanlon]

Fair enough. Let me know when, and we'll arrange a get together. It's a shame you haven't been here this week, the lady santas have looked very fine down on the quayside. Ho ho ho.

I'm not a stalker, I just know things. Oh by the way, you're out of milk.

Forgive your enemies - it messes with their heads

My blog | My articles | MoXAML PowerToys | Onyx

[PIEBALDconsult]

http://en.wikipedia.org/wiki/Luhn_algorithm[^]

[jschell]

Depends on what you mean by validate. One of the other posts provide a link to do a simple check sum on the digits itself. This is a simple test that can be done in a GUI. A number that passes that test still might not be a valid number in that numbers have certain rules related to the card type (such as Visa.) There are simple methods that one can use to validate those however the only correct way requires that one get the bin numbers from a valid processor and check them. Of course a number is only valid if a processor accepts it. Doing that requires a lot of code and will be specific to each processor. Both of those make it pointless for anyone to post such solutions here. And none of that has anything at all to do with securing ecommerce payment applications.

[DaveyM69]

Many numbers in use use the Luhn algorithm to generate/check the final digit of the number. Credit cards, debit cards, cell phone IMEI numbers, SIM cards are just a few examples of these. It will tell you that the number is theoretically valid only. At work I have a class I wrote a while ago with all this stuff in. I would paste it here but I'm not back at work til 4th Jan - it's pretty easy to implement though so you should be able to do it yourself.

Dave
Binging is like googling, it just feels dirtier. Please take your VB.NET out of our nice case sensitive forum. Astonish us. Be exceptional. (Pete O'Hanlon)
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[Dr Walt Fair PE]

bool IsCardValid(string CCNumber)
{
return (CustomerResponse("Is this your card?") == "Yes")
&& (ExpirationDate > DateTime.Now());
}

CQ de W5ALT

Walt Fair, Jr., P. E. Comport Computing Specializing in Technical Engineering Software

[LloydA111]

WTF is a "Skilties"?

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See if you can crack this: fb29a481781fe9b3fb8de57cda45fbef

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[Bernhard Hiller]

Dear friends on CodeProject, do not discourage the OP! Have you ever been to India? I just spent 4 weeks of holidays there, and I can tell you from my experience: credit/debit card validation is a real issue! In 1 hotel only were my credit cards accepted, all other hotels failed - and of course none had the old type of machines doing a simple paper offprint as a fall-back solution... I had to get cash from (Indian) ATMs... At the first machine, I failed using it, on the first screen I saw the logo of the bank and its name on top, a "WELCOME:" in bold black letters on the middle left, and a "CONTINUE" on the middle right, I selected "CONTINUE" and was back to this page. A security man could tell me that I was expected to enter my PIN here (and in fact, in small dark gray characters on a light gray background it read "Please enter your PIN", where I previously thought was part of the logo). But in the end, the transaction failed for unknown reasons. After many more failures at different ATMs, I tried to change cash at a Western Union office, which they were not licensed to do, but they told me that only a few banks can handle non-Indian MasterCards, and could give me two suggestions to try. At ICICI bank, the transaction failed, but their staff told me that they can do, I should try later again, and it failed again... Only from the ATM of HDFC bank I could get cash (and that ATM looked like Western make, quite different from the other ones). Some time ago, some (Indian?) guy asked here on CodeProject how to program a cash machine. We should have provided him with much more guidance! In the end, we could become victims of our failure to guide such newbies.

[Cnu55555]

Thanks for Ur reply.. But i need to validate CCNumber is it possible?

[Cnu55555]

Actually SECURE E-COMMERCE is my acadamic project. In that i need to validate Credit card atleast Visa card. My thinking is when the user give card no. how can we validate ? and what are the reqmnts to validate?

[Cnu55555]

Thank Q