private void timKiem() { sKeyword = txtSearch.Text.Trim(); // List<KhachHangDTO> ListKhachHang = khachHangBUS.getListKhachHangByKey(sKeyword); DataTable dataHang = hangBUS.GetDataTableHangByKey(sKeyword); if (sKeyword == null || sKeyword == string.Empty || sKeyword.Length == 0) { this.loadDanhSachHang(); } else { dataGridViewHang.DataSource = dataHang; dataGridViewHang.Refresh(); dataGridViewHang.Update(); } }