private void brnSubmit_Click(object sender, EventArgs e)
        {
            int psId = 0;
            int.TryParse(txtPrintSeriesId.Text, out psId);
            var psObj = new PrintSeries
            {
                Id = psId,
                GivenTo = (cmbGivenTo.SelectedItem as Employee).Id,
                PrintseriesStart = Convert.ToInt32(txtStartNumber.Text),
                PrintseriesEnd = Convert.ToInt32(txtEndNumber.Text),
                CreatedOn = DateTime.Now,
                CreatedBy = 1
            };

            var psDao = new PrintSeriesDao();
            psDao.SavePrintSeries(psObj);
            ShowPrintSeries();
        }