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                    private void Hinzu_Click(object sender, EventArgs e)
                    {
                    xlexcel = new Excel.Application();

                    xlexcel.Visible = false;

                    // Open a File
                    xlWorkBook = xlexcel.Workbooks.Open(Ziel, 0, false, 5, "", "", true,
                    Microsoft.Office.Interop.Excel.XlPlatform.xlWindows, "\t", false, false, 0, true, 1, 0);
                    xlWorkSheet = (Excel.Worksheet)xlWorkBook.Worksheets.get_Item(comboBox1.Text);

                    int _lastRow = xlWorkSheet.Range["A" + xlWorkSheet.Rows.Count].End[Excel.XlDirection.xlUp].Row + 1;

                    xlWorkSheet.Cells[_lastRow, 1] = textBox1.Text;
                    xlWorkSheet.Cells[_lastRow, 2] = textBox2.Text + "€";

                    xlWorkBook.Save();
                    xlWorkBook.Close(true, misValue, misValue);
                    xlexcel.Quit();

                    releaseObject(xlWorkSheet);
                    releaseObject(xlWorkBook);
                    releaseObject(xlexcel);
                }