public void SetHeaderValues(string transactionType, SPDHMessageType messageType, SPDHMessageSubType subType, DateTime datetime, string terminalID, string employeeId)
{
Header.SetValue(HeaderEntryEnum.ProcessingFlag1, Formatting.HexStringToByteArray(""));
Header.SetValue(HeaderEntryEnum.ProcessingFlag2, Formatting.ASCIIStringToByteArray("5"));
Header.SetValue(HeaderEntryEnum.ProcessingFlag3, Formatting.HexStringToByteArray(""));
Header.SetValue(HeaderEntryEnum.ResponseCode, Formatting.HexStringToByteArray(""));
Header.SetValue(HeaderEntryEnum.TransactionCode, Formatting.ASCIIStringToByteArray(transactionType));
Header.SetValue(HeaderEntryEnum.CurrentDate, Formatting.ASCIIStringToByteArray(Formatting.ConvertDateToString(datetime, "yyMMdd")));
Header.SetValue(HeaderEntryEnum.CurrentTime, Formatting.ASCIIStringToByteArray(Formatting.ConvertDateToString(datetime, "HHmmss")));
Header.SetValue(HeaderEntryEnum.MessageType, new byte[] { (byte)messageType });
Header.SetValue(HeaderEntryEnum.MessageSubtype, new byte[] { (byte)subType });
Header.SetValue(HeaderEntryEnum.TerminalID, Formatting.ASCIIStringToByteArray(terminalID));
Header.SetValue(HeaderEntryEnum.EmployeeID, Formatting.ASCIIStringToByteArray(employeeId));
}