protected void btnThanhToan_Click(object sender, EventArgs e) { sanphamBLL bss = new sanphamBLL(); List <giohangDAL> cart = (List <giohangDAL>)Session["cart"]; List <userpublicDAL> usp = (List <userpublicDAL>)Session["userPublic"]; dathangBLL bs = new dathangBLL(); bs.add_dathang(usp[0].id_user, Convert.ToInt32(ddThanhToan.SelectedValue)); int id = bs.id_dathang(usp[0].id_user); for (int i = 0; i <= cart.Count - 1; i++) { int y = Convert.ToInt32(cart[i].id_sanpham); List <sanphamDAL> liSoLuong = bss.getSPbyId(y); bs.add_dathang_detail(cart[i].id_sanpham, id, cart[i].soluong, cart[i].size); int pi = liSoLuong[0].soluong - cart[i].soluong; bs.soluong_sp(cart[i].id_sanpham, pi); } Session.Remove("cart"); Response.Redirect("success.aspx"); }