public static string GetCardType(string Number)
{
//start without knowing the credit card type
var result = "unknown";
//first check for MasterCard
if (Regex.Match(Number, @"^5[1-5]").Success)
{
result = "mastercard";
}
//then check for Visa
else if (Regex.Match(Number, @"^4").Success)
{
result = "visa";
}
//then check for AmEx
else if (Regex.Match(Number, @"^3[47]").Success)
{
result = "amex";
}
return result;
}
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