private void btnLuu_Click(object sender, EventArgs e) { nbcDS.OptionsNavPane.NavPaneState = DevExpress.XtraNavBar.NavPaneState.Collapsed; if (!them) { string maDS = gvDauSach.GetFocusedRowCellValue(colMaDS).ToString(); int sl = Convert.ToInt32(tbSoLuong.Text); for (int i = 1; i <= sl; i++) { string maSach = nextMa(Sach_BUS.LastMaSach()); Sach_BUS.themSach(maDS, maSach, "Tốt", "Không"); SbindingSource.DataSource = Sach_BUS.LoadDSSach(maDS); gcSach.DataSource = SbindingSource; Load(); } MessageBox.Show("Thêm thành công!"); them = true; tbSoLuong.Clear(); } }