How to find whether a card is debit card or credit card?

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ASP.NET4

Hi,
I need to find out whether a card is DEBIT CARD and CREDIT CARD. Can you please provide the code in C#.Net. I am able to validate credit card but I am not able to validate Debit card. Below is the Credit card validation code-

Validating a credit card-

public static bool IsCardNumberValid(string cardNumber)
{
  int i, checkSum = 0;

  // Compute checksum of every other digit starting from right-most digit
  for (i = cardNumber.Length - 1; i >= 0; i -= 2)
    checkSum += (cardNumber[i] - '0');

  // Now take digits not included in first checksum, multiple by two,
  // and compute checksum of resulting digits
  for (i = cardNumber.Length - 2; i >= 0; i -= 2)
  {
    int val = ((cardNumber[i] - '0') * 2);
    while (val > 0)
    {
      checkSum += (val % 10);
      val /= 10;
    }
  }

  // Number is valid if sum of both checksums MOD 10 equals 0
  return ((checkSum % 10) == 0);
}

Removing all non-digit characters from a credit card number.

public static string NormalizeCardNumber(string cardNumber)
{
  if (cardNumber == null)
    cardNumber = String.Empty;

  StringBuilder sb = new StringBuilder();

  foreach (char c in cardNumber)
  {
    if (Char.IsDigit(c))
      sb.Append(c);
  }

  return sb.ToString();
}

Class to hold credit card type information-

public enum CardType
{
  Unknown = 0,
  MasterCard = 1,
  VISA = 2,
  Amex = 3,
  Discover = 4,
  DinersClub = 5,
  JCB = 6,
  enRoute = 7
}

private class CardTypeInfo
{
  public CardTypeInfo(string regEx, int length, CardType type)
  {
    RegEx = regEx;
    Length = length;
    Type = type;
  }

  public string RegEx { get; set; }
  public int Length { get; set; }
  public CardType Type { get; set; }
}

// Array of CardTypeInfo objects.
// Used by GetCardType() to identify credit card types.
private static CardTypeInfo[] _cardTypeInfo =
{
  new CardTypeInfo("^(51|52|53|54|55)", 16, CardType.MasterCard),
  new CardTypeInfo("^(4)", 16, CardType.VISA),
  new CardTypeInfo("^(4)", 13, CardType.VISA),
  new CardTypeInfo("^(34|37)", 15, CardType.Amex),
  new CardTypeInfo("^(6011)", 16, CardType.Discover),
  new CardTypeInfo("^(300|301|302|303|304|305|36|38)", 
                   14, CardType.DinersClub),
  new CardTypeInfo("^(3)", 16, CardType.JCB),
  new CardTypeInfo("^(2131|1800)", 15, CardType.JCB),
  new CardTypeInfo("^(2014|2149)", 15, CardType.enRoute),
};

public static CardType GetCardType(string cardNumber)
{
  foreach (CardTypeInfo info in _cardTypeInfo)
  {
    if (cardNumber.Length == info.Length && 
        Regex.IsMatch(cardNumber, info.RegEx))
      return info.Type;
  }

  return CardType.Unknown;
}

Thanks,
Niraj Kumar.

What I have tried:

I tried to use else statement in which I tried finding Debit card validation.