public IHttpActionResult CreateItems([FromBody] ProductDetailViewModel databody, string condition = "", int?userDemand = 0, decimal?duration = 0, char?deli = null)
        {
            using (var db = new DB_Context())
            {
                try
                {
                    ProductDetailViewModel prodDetail = new ProductDetailViewModel();
                    Product product = databody.convertToProduct(condition, userDemand, duration, deli);
                    db.Products.Add(product);
                    db.SaveChanges();

                    return(Ok("Insert Data Success"));
                }
                catch (Exception)
                {
                    throw;
                }
            }
        }