EpgTimer.RecSettingView.button_del_preset_Click C# (CSharp) Method

        private void button_del_preset_Click(object sender, RoutedEventArgs e)
        {
            try
            {
                if (comboBox_preSet.SelectedItem != null)
                {
                    RecPresetItem item = comboBox_preSet.SelectedItem as RecPresetItem;
                    if (item.ID == 0)
                    {
                        MessageBox.Show("デフォルトは削除できません");
                        return;
                    }
                    else if (item.ID == 0xFFFFFFFF)
                    {
                        MessageBox.Show("このプリセットは変更できません");
                        return;
                    }
                    else
                    {
                        presetList.Remove(item.ID);
                        comboBox_preSet.Items.Remove(item);

                        lastSelectIndex = -1;
                        comboBox_preSet.SelectedIndex = 0;
                        SavePreset();
                    }
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message + "\r\n" + ex.StackTrace);
            }
        }