private void btnCloseSerial_Click(object sender, EventArgs e) { mf.SerialPortCloseGPS(); if (mf.sp.IsOpen) { cboxBaud.Enabled = false; cboxPort.Enabled = false; btnCloseSerial.Enabled = true; btnOpenSerial.Enabled = false; } else { cboxBaud.Enabled = true; cboxPort.Enabled = true; btnCloseSerial.Enabled = false; btnOpenSerial.Enabled = true; } }