private void ImportStart()
        {
            int catalogID = -1;

            labelSuccess.Content = "0";
            labelFailed.Content  = "0";

            if (datagridFilelist.Items.Count == 0)
            {
                return;
            }

            if ((bool)labelGenre.Tag == false)
            {
                var result = MessageBox.Show($"Missing genre '{comboboxGenre.Text}' in table tGenre!\n\n" +
                                             "You want create this genre?", "New Genre", MessageBoxButton.YesNo, MessageBoxImage.Exclamation);
                if (result == MessageBoxResult.No)
                {
                    return;
                }
                else
                {
                    catalogID = DataGetSet.CreateGenre(comboboxGenre.Text);
                }
            }

            if ((bool)labelCatalog.Tag == false)
            {
                var result = MessageBox.Show($"Missing catalog '{comboboxCatalog.Text}' in table tCatalogs!\n\n" +
                                             "You want create this catalog?", "New Catalog", MessageBoxButton.YesNo, MessageBoxImage.Exclamation);
                if (result == MessageBoxResult.No)
                {
                    return;
                }

                catalogID = DataGetSet.CreateCatalog(comboboxCatalog.Text);

                if (catalogID == -1)
                {
                    return;
                }
            }

            Import((bool)checkboxSampler.IsChecked);
        }