Read track data from card - Return account number and site code

ReadCardTrack.cs

// acct number + site code: %6074=4369371343068064237?;6074=0000000000303942?
public static string FormatAcctNumber(string cardNumber, out string siteCode)
		{
			// split data by 
			string[] array = cardNumber.Split(';');
			string data = array[1];
			string[] dataArray = data.Split('=');
			siteCode = dataArray[0];
			string acctNumber = dataArray[1];
			// remove question mark
			int questionMark = acctNumber.IndexOf('?');
			acctNumber = acctNumber.Remove(questionMark, 1);
			// remove leading 0s
			acctNumber = acctNumber.TrimStart(new char[] {'0'});
			return acctNumber;
		}