public ActionResult Payment(int idkh, string tenkh, string sdt, string diachi, string email) { var order = new HoaDon(); order.MaKh = idkh; order.NgayNhap = DateTime.Now; order.TenNguoiNhan = tenkh; order.SdtNguoiNhan = sdt; order.DiaChiNguoiNhan = diachi; order.EmailNguoiNhan = email; var id = new HoaDonDao().Insert(order); var cart = (List <Cartitem>)Session[CartSession]; var chitiet = new ChiTietHoaDonDao(); foreach (var item in cart) { var cthoadon = new ChiTietHoaDon(); cthoadon.MaSach = item.Sach.IDSach; cthoadon.MaHoaDon = id; cthoadon.SoLuongMua = item.SoLuong; cthoadon.Gia = item.Sach.Gia * item.SoLuong; chitiet.Insert(cthoadon); } return(Redirect("/hoan-thanh")); }