var tb1 = Tb1.Text; if (string.IsNullOrEmpty(tb1)) { tb1 = "0000"; } var s1 = tb1.Substring(0, 2); var int_1 = Convert.ToInt32(s1, 16); var s2 = tb1.Substring(2, 2); var int_2 = Convert.ToInt32(s2, 16); var bt1 = Convert.ToByte(int_1); var bt2 = Convert.ToByte(int_2); var bt = new byte[] { 0xfc, 0x07, bt1, bt2 }; var vCrc = CrcCcitt.Crc(bt); tb_status.Text += "Disable Set --->" + Environment.NewLine; tb_status.Text += "["; foreach (var b in vCrc) { tb_status.Text += Convert.ToString(b, 16) + " "; } tb_status.Text += "]" + Environment.NewLine; var data = _intoNotes.SettingCommand(vCrc); tb_status.Text += data + Environment.NewLine;