private void UpdateDatabase()
        {
            DB.Open();
            DB.BeginTransaction();
            try
            {
                double oldTotalTakenVacationDays = double.Parse(tbxMax.Text) - double.Parse(tbxRemaining.Text);

                VacationsAddRequestsInformation vacationsAddRequestsInformation = new VacationsAddRequestsInformation(vacationsAddTDS);
                int requestId = vacationsAddRequestsInformation.Save(oldTotalTakenVacationDays);

                VacationsAddDaysInformation vacationsAddDaysInformation = new VacationsAddDaysInformation(vacationsAddTDS);
                vacationsAddDaysInformation.Save(requestId);

                vacationsAddTDS.AcceptChanges();

                // Store dataset
                Session["vacationsAddTDS"] = vacationsAddTDS;
                Session["vacationDaysInformation"] = vacationsAddTDS.DaysInformation;

                DB.CommitTransaction();
            }
            catch (Exception ex)
            {
                DB.RollbackTransaction();

                string url = string.Format("./../../error_page.aspx?error={0}", ex.Message.Replace('\n', ' '));
                Response.Redirect(url);
            }
        }