private void btnDSDauSach_ItemClick(object sender, DevExpress.XtraBars.ItemClickEventArgs e) { Enable(true); Load(); DataTable dtb = TheLoai_BUS.DStenTL(); for (int i = 0; i < dtb.Rows.Count; i++) { // string name = dtb.Rows[i][0].ToString().ToUpper(); string name = ChuanHoa(dtb.Rows[i][0].ToString().ToLower()); cboTheLoai.Items.Add(name); repositoryItemComboBox1.Items.Add(name); } }