//hien thi len lable
        private void list1_CellClick(object sender, DataGridViewCellEventArgs e)
        {
            //lay dong hien tai
            int dong = list1.CurrentCell.RowIndex;

            if (list1.Rows.Count - 1 == dong)
            {
                return;
            }

            //lay ma phieu
            string maPhieu = list1.Rows[dong].Cells[0].Value.ToString();

            //Mang gia tri
            string[] param = obj.layThongTinPhieu(maPhieu);
            string   ngay  = param[2].Substring(0, 9);
            string   oDate = Convert.ToDateTime(ngay).ToString("dd/MM/yyyy");

            //hien thi label
            lbMaPhieu.Text   = maPhieu;
            lbMaDocGia.Text  = param[0];
            lbTenDocGia.Text = param[1];
            lbNgayMuon.Text  = oDate;
            lbMaNV.Text      = param[3];
            lbTenNV.Text     = param[4];

            //hien thi chi tiet cac tai lieu muon (PhieuMuonChiIiet5)
            loadList2();
        }
        protected void GridView1_SelectedIndexChanged(object sender, EventArgs e)
        {
            string madg = (String)Session["madg"];

            if (madg.Length > 0)
            {
                loadBang1(madg);
            }
            PhieuTraSachBUS obj = new PhieuTraSachBUS();
            //lay ma phieu
            string maPhieu = GridView1.SelectedRow.Cells[1].Text;

            //Session["maphieu"] = maPhieu;
            //Mang gia tri
            string[] param = obj.layThongTinPhieu(maPhieu);
            string   ngay  = param[2].Substring(0, 9);
            string   oDate = Convert.ToDateTime(ngay).ToString("dd/MM/yyyy");

            //hien thi label
            lbMaPhieu.Text   = maPhieu;
            lbMaDocGia.Text  = param[0];
            lbTenDocGia.Text = param[1];
            lbNgayMuon.Text  = oDate;
            lbMaNV.Text      = param[3];
            lbTenNV.Text     = param[4];

            //lấy key tìm kiếm
            //đổ dữ liệu

            //hien thi chi tiet cac tai lieu muon (PhieuMuonChiIiet5)
            loadList2();
        }