private void btnCloseSerialArduino_Click(object sender, EventArgs e) { mf.SerialPortMachineClose(); if (mf.spMachine.IsOpen) { cboxArdPort.Enabled = false; btnCloseSerialArduino.Enabled = true; btnOpenSerialArduino.Enabled = false; } else { cboxArdPort.Enabled = true; btnCloseSerialArduino.Enabled = false; btnOpenSerialArduino.Enabled = true; } }