5-digit Credit Card Number With Fifth Digit As Check Digit

Apr 6, 2010

I just finished this application where you enter a five-digit credit card number, with the fifth digit being the check digit. everything seems to work except, I can't seem to get it to determine that any number is "valid". Every 5-digit combination that I enter returns "The credit card number is not valid". Im using visual basic 2008 express

[Code]....

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I need to make a app that verifies a five digit credit card number. The check digit is 5th and is found by multiplying the 2nd and 4th digit. Heres my current

Dim strInput As String
Dim strOutput As String
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[code]....

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[Code]...

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[CODE]...

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[code]....

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