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Validate IBAN Using C#

January 5, 2017 Leave a comment

Hi all,

Try this example to Validate IBAN Using C#

public static bool ValidateBankAccount(string bankAccount)
{
bankAccount = bankAccount.ToUpper(); //IN ORDER TO COPE WITH THE REGEX BELOW
if (String.IsNullOrEmpty(bankAccount))
return false;
else if (System.Text.RegularExpressions.Regex.IsMatch(bankAccount, "^[A-Z0-9]"))
{
bankAccount = bankAccount.Replace(" ", String.Empty);
string bank =
bankAccount.Substring(4, bankAccount.Length - 4) + bankAccount.Substring(0, 4);
int asciiShift = 55;
StringBuilder sb = new StringBuilder();
foreach (char c in bank)
{
int v;
if (Char.IsLetter(c)) v = c - asciiShift;
else v = int.Parse(c.ToString());
sb.Append(v);
}
string checkSumString = sb.ToString();
int checksum = int.Parse(checkSumString.Substring(0, 1));
for (int i = 1; i < checkSumString.Length; i++)
{
int v = int.Parse(checkSumString.Substring(i, 1));
checksum *= 10;
checksum += v;
checksum %= 97;
}
return checksum == 1;
}
else
return false;
} 

Hope this helps

Good Luck

Categories: ASP.Net