private void Button_Click(object sender, RoutedEventArgs e)
        {
            string s = (string)((Button)e.OriginalSource).Name;

            switch (s)
            {
            case "btn_Auftragskonto":
                AuftragsKontoFields.Add(txtBox_AddFieldValue.Text);

                break;

            case "btn_Buchungstag":
                BuchungstagFields.Add(txtBox_AddFieldValue.Text);
                listBoxBuchungstagField.ItemsSource = BuchungstagFields;
                break;

            case "btn_WertDatum":
                WertDatumFields.Add(txtBox_AddFieldValue.Text);
                break;

            case "btn_Buchungstext":
                BuchungsTextFields.Add(txtBox_AddFieldValue.Text);
                break;

            case "btn_Verwendungszweck":
                VerwendZweckFields.Add(txtBox_AddFieldValue.Text);
                break;

            case "btn_Beguenstigter":
                BeguenstigerFields.Add(txtBox_AddFieldValue.Text);
                break;

            case "btn_Kontonummer":
                KontonummerFields.Add(txtBox_AddFieldValue.Text);
                break;

            case "btn_BLZ":
                BLZFields.Add(txtBox_AddFieldValue.Text);
                break;

            case "btn_Betrag":
                BetragFields.Add(txtBox_AddFieldValue.Text);
                break;

            case "btn_Waehrung":
                WaehrungFields.Add(txtBox_AddFieldValue.Text);
                break;

            case "btn_CodePageCSV":
                if (listBoxCodepageInputCSV.SelectedIndex != -1 && listBoxCodepageInputCSV.SelectedIndex != 0)
                {
                    SweapEncoding();
                }
                break;
            }
        }