EpgTimer.RecSettingView.button_chg_preset_Click C# (CSharp) Method

        private void button_chg_preset_Click(object sender, RoutedEventArgs e)
        {
            try
            {
                if (comboBox_preSet.SelectedItem != null)
                {
                    RecPresetItem item = comboBox_preSet.SelectedItem as RecPresetItem;

                    if (item.ID == 0xFFFFFFFF)
                    {
                        MessageBox.Show("このプリセットは変更できません");
                        return;
                    }

                    AddPresetWindow setting = new AddPresetWindow();
                    PresentationSource topWindow = PresentationSource.FromVisual(this);
                    if (topWindow != null)
                    {
                        setting.Owner = (Window)topWindow.RootVisual;
                    }
                    setting.SetMode(true);
                    setting.SetName(item.DisplayName);
                    if (setting.ShowDialog() == true)
                    {
                        String name = "";
                        setting.GetName(ref name);

                        RecSettingData newSet = new RecSettingData();
                        GetRecSetting(ref newSet);
                        item.DisplayName = name;
                        presetList[item.ID] = newSet;

                        SavePreset();

                        comboBox_preSet.Items.Refresh();
                    }
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message + "\r\n" + ex.StackTrace);
            }
        }