public static bool WriteToSerialPort(byte[]byteArr)
    {
      SerialPort Com = newSerialPort();
      try
      {
        Com.ReadTimeout = 5000;
        Com.WriteTimeout = 5000;
        Com.PortName = "Com1";
        Com.BaudRate = 9600;
        Com.StopBits = StopBits.One;
        Com.Parity = Parity.None;
        Com.Open();
        Com.Write(byteArr, 0,byteArr.Length);
        return true;
      }
      catch(Exception ex)
      {
        return false;
      }
      finally
      {
        Com.Close();
      }      
    }