public static bool isValidCard(String cc)
{
cc = cc.Replace(" ", string.Empty);
// Check if cc flag is valid
if (!CreditCardValidator.isValidFlag(cc))
{
return(false);
}
int sum = 0;
char[] reverseCC = cc.ToCharArray();
Array.Reverse(reverseCC);
for (int i = 0; i < reverseCC.Length; i++)
{
if (i % 2 == 0)
{
sum += Convert.ToInt16(reverseCC[i].ToString());
}
else
{
int newValue = (int)(Convert.ToInt16((reverseCC[i].ToString())) * 2);
sum += Convert.ToInt16((newValue > 9 ? (newValue - 9) : newValue).ToString());
}
}
if ((sum % 10) == 0)
{
return(true);
}
else
{
return(false);
}
}
