public ActionResult GetProduct(string id, string keyword)
        {
            var listProduct = new SanPhamDao().getListSanPham();
            var model       = new List <ProductModel>();
            var ctCTKM      = new SanPhamDao().getListctCTKM(id);

            foreach (var item in listProduct)
            {
                var check = false;
                var temp  = ctCTKM.Where(x => x.MASANPHAM == item.MASANPHAM).FirstOrDefault();
                if (temp != null)
                {
                    check = true;
                }
                model.Add(new ProductModel()
                {
                    MaSanPham  = item.MASANPHAM,
                    TenSanPham = item.TENSANPHAM,
                    select     = check
                });
            }
            if (string.IsNullOrEmpty(keyword))
            {
                return(Json(model, JsonRequestBehavior.AllowGet));
            }
            else
            {
                return(Json(model.Where(x => x.TenSanPham.Contains(keyword) || x.MaSanPham.Contains(keyword)), JsonRequestBehavior.AllowGet));
            }
        }