CHDKPTPRemote.Session.Connect C# (CSharp) Method

        public void Connect()
        {
            _session.device.Open();
            try
            {
                _session.OpenSession();
            }
            catch (Exception e)
            {
                _session.device.Close();
                throw e;
            }
        }

        private void connectbutton_Click(object sender, EventArgs e)
        {
            if (connected)
            {
                MessageBox.Show("Already opened a device!", "Error");
                return;
            }

            if (devicecombobox.SelectedItem == null)
            {
                MessageBox.Show("No device selected!", "Error");
                return;
            }

            connected_device = devicecombobox.SelectedItem as CHDKPTPDevice;

            LogLine("opening device: " + connected_device.Name);
            try
            {
                session = new Session(connected_device);
                session.Connect();
            }
            catch (Exception ex)
            {
                LogLine("exception: " + ex.Message + Environment.NewLine + ex.StackTrace.ToString());
                connected = false;
                connected_device = null;
                session = null;
                MessageBox.Show("could not open PTP session: " + ex.Message + "\n\n" + ex.StackTrace.ToString());
                return;
            }
            LogLine("connected.");
            connected = true;
            statuslabel.Text = "Connected to: " + connected_device.ToString();
        }