Comments on: Credit Card Validation in C# http://jlcoady.net/c-sharp/credit-card-validation-in-c-sharp Wed, 13 Oct 2010 08:27:13 +0000 hourly 1 http://wordpress.org/?v=3.0.1 By: Marinus http://jlcoady.net/c-sharp/credit-card-validation-in-c-sharp/comment-page-1#comment-2583 Marinus Wed, 13 Oct 2010 08:27:13 +0000 http://jlcoady.net/?p=145#comment-2583 Can you please tell me if i have a Text box how will it be possible to send the text box text information through this class public static bool Validate(CardType cardType, string cardNumber) Can you please tell me if i have a Text box how will it be possible to send the text box text information through this class

public static bool Validate(CardType cardType, string cardNumber)

]]> By: Navnit http://jlcoady.net/c-sharp/credit-card-validation-in-c-sharp/comment-page-1#comment-506 Navnit Fri, 22 Jan 2010 09:11:04 +0000 http://jlcoady.net/?p=145#comment-506 public sealed class Card_Validation { string MasterCard, BankCard, Visa, AmericanExpress, Discover, DinersClub, JCB; private Card_Validation() { } // static only //public static bool Validate(CardType cardType, string cardNumber) public static bool Validate(string cardType, string cardNumber) { byte[] number = new byte[16]; // number to validate // Remove non-digits int len = 0; for(int i = 0; i 5) return false; break; case "BankCard": if(len != 16) return false; if(number[0] != 5 || number[1] != 6 || number[2] > 1) return false; break; case "Visa": if(len != 16 && len != 13) return false; if(number[0] != 4) return false; break; case "AmericanExpress": if(len != 15) return false; if(number[0] != 3 || (number[1] != 4 && number[1] != 7)) return false; break; case "Discover": if(len != 16) return false; if(number[0] != 6 || number[1] != 0 || number[2] != 1 || number[3] != 1) return false; break; case "DinersClub": if(len != 14) return false; if(number[0] != 3 || (number[1] != 0 && number[1] != 6 && number[1] != 8) || number[1] == 0 && number[2] > 5) return false; break; case "JCB": if(len != 16 && len != 15) return false; if(number[0] != 3 || number[1] != 5) return false; break; } // Use Luhn Algorithm to validate int sum = 0; for(int i = len - 1; i >= 0; i--) { if(i % 2 == len % 2) { int n = number[i] * 2; sum += (n / 10) + (n % 10); } else sum += number[i]; } return (sum % 10 == 0); } } public sealed class Card_Validation
{
string MasterCard, BankCard, Visa, AmericanExpress, Discover, DinersClub, JCB;
private Card_Validation()
{
} // static only

//public static bool Validate(CardType cardType, string cardNumber)
public static bool Validate(string cardType, string cardNumber)
{
byte[] number = new byte[16]; // number to validate

// Remove non-digits
int len = 0;
for(int i = 0; i 5)
return false;
break;

case “BankCard”:
if(len != 16)
return false;
if(number[0] != 5 || number[1] != 6 || number[2] > 1)
return false;
break;

case “Visa”:
if(len != 16 && len != 13)
return false;
if(number[0] != 4)
return false;
break;

case “AmericanExpress”:
if(len != 15)
return false;
if(number[0] != 3 || (number[1] != 4 && number[1] != 7))
return false;
break;

case “Discover”:
if(len != 16)
return false;
if(number[0] != 6 || number[1] != 0 || number[2] != 1 || number[3] != 1)
return false;
break;

case “DinersClub”:
if(len != 14)
return false;
if(number[0] != 3 || (number[1] != 0 && number[1] != 6 && number[1] != 8)
|| number[1] == 0 && number[2] > 5)
return false;
break;

case “JCB”:
if(len != 16 && len != 15)
return false;
if(number[0] != 3 || number[1] != 5)
return false;
break;
}

// Use Luhn Algorithm to validate
int sum = 0;
for(int i = len – 1; i >= 0; i–)
{
if(i % 2 == len % 2)
{
int n = number[i] * 2;
sum += (n / 10) + (n % 10);
}
else
sum += number[i];
}
return (sum % 10 == 0);
}
}

]]> By: Navnit http://jlcoady.net/c-sharp/credit-card-validation-in-c-sharp/comment-page-1#comment-505 Navnit Fri, 22 Jan 2010 09:09:28 +0000 http://jlcoady.net/?p=145#comment-505 if(len == 16) return false; // number has too many digits number[len++] =Convert.ToByte(cardNumber[i]); if(len == 16) return false; // number has too many digits
number[len++] =Convert.ToByte(cardNumber[i]);

]]> By: Howzilla http://jlcoady.net/c-sharp/credit-card-validation-in-c-sharp/comment-page-1#comment-363 Howzilla Tue, 29 Sep 2009 02:21:19 +0000 http://jlcoady.net/?p=145#comment-363 Thanks for the code. You really saved me some time with this. Thanks for the code. You really saved me some time with this.

]]> By: mexicotom http://jlcoady.net/c-sharp/credit-card-validation-in-c-sharp/comment-page-1#comment-305 mexicotom Wed, 05 Aug 2009 02:01:30 +0000 http://jlcoady.net/?p=145#comment-305 Your Luhn algorithm is interesting, but according to my tests is 10x slower than this one: http://orb-of-knowledge.blogspot.com/2009/08/extremely-fast-luhn-function-for-c.html Also, line #23 is not compiling for me, as it complains that Byte.Parse cannot take a char, but must take a string. I then had to call .ToString() on the char value to make it work (which may account for some of the slowness mentioned above). Your Luhn algorithm is interesting, but according to my tests is 10x slower than this one:

http://orb-of-knowledge.blogspot.com/2009/08/extremely-fast-luhn-function-for-c.html

Also, line #23 is not compiling for me, as it complains that Byte.Parse cannot take a char, but must take a string. I then had to call .ToString() on the char value to make it work (which may account for some of the slowness mentioned above).

]]> By: Nitin Sawant http://jlcoady.net/c-sharp/credit-card-validation-in-c-sharp/comment-page-1#comment-265 Nitin Sawant Sat, 02 May 2009 15:04:18 +0000 http://jlcoady.net/?p=145#comment-265 can you provide C# code to generate valide credit cards?? regards, Nitin Sawant can you provide C# code to generate valide credit cards??

regards,
Nitin Sawant

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