protected string PadCardLast4(Enums.CreditCardType cardType, string last4)
{
string retVal = string.Empty;
switch (cardType)
{
case Enums.CreditCardType.AmericanExpress:
case Enums.CreditCardType.Discover:
case Enums.CreditCardType.MasterCard:
case Enums.CreditCardType.Visa:
retVal = "XXXXXXXXXXXX" + last4;
break;
case Enums.CreditCardType.Unknown:
default:
break;
}
return(retVal);
}
private Enums.CreditCardType ValidateCardNumber(string sCardNumber)
{
string cardNum = sCardNumber.Replace(" ", "");
Enums.CreditCardType retVal = Enums.CreditCardType.Unknown;
//validate the type of card is accepted
if (cardNum.StartsWith("4") == true &&
(cardNum.Length == 13 ||
cardNum.Length == 16))
{
//VISA
retVal = Enums.CreditCardType.Visa;
}
else if ((cardNum.StartsWith("51") == true ||
cardNum.StartsWith("52") == true ||
cardNum.StartsWith("53") == true ||
cardNum.StartsWith("54") == true ||
cardNum.StartsWith("55") == true) &&
cardNum.Length == 16)
{
//MasterCard
retVal = Enums.CreditCardType.MasterCard;
}
else if ((cardNum.StartsWith("34") == true ||
cardNum.StartsWith("37") == true) &&
cardNum.Length == 15)
{
//Amex
retVal = Enums.CreditCardType.AmericanExpress;
}
//else if ((cardNum.StartsWith("300") == true ||
// cardNum.StartsWith("301") == true ||
// cardNum.StartsWith("302") == true ||
// cardNum.StartsWith("304") == true ||
// cardNum.StartsWith("305") == true ||
// cardNum.StartsWith("36") == true ||
// cardNum.StartsWith("38") == true) &&
// cardNum.Length == 14)
//{
// //Diners Club/Carte Blanche
// retVal = Enums.CreditCardType.DinersClub;
//}
else if (cardNum.StartsWith("6011") == true &&
cardNum.Length == 16)
{
//Discover
retVal = Enums.CreditCardType.Discover;
}
if (retVal != Enums.CreditCardType.Unknown)
{
int[] DELTAS = new int[] { 0, 1, 2, 3, 4, -4, -3, -2, -1, 0 };
int checksum = 0;
char[] chars = cardNum.ToCharArray();
for (int i = chars.Length - 1; i > -1; i--)
{
int j = ((int)chars[i]) - 48;
checksum += j;
if (((i - chars.Length) % 2) == 0)
{
checksum += DELTAS[j];
}
}
if ((checksum % 10) != 0)
{
retVal = Enums.CreditCardType.Unknown;
}
}
return(retVal);
}
