// PUT api/ProductTypes/5
        public HttpResponseMessage PutProductType(int id, ProductType producttype)
        {
            if (!ModelState.IsValid)
            {
                return Request.CreateErrorResponse(HttpStatusCode.BadRequest, ModelState);
            }

            if (id != producttype.Id)
            {
                return Request.CreateResponse(HttpStatusCode.BadRequest);
            }

            data.Entry(producttype).State = EntityState.Modified;

            try
            {
                data.SaveChanges();
            }
            catch (DbUpdateConcurrencyException ex)
            {
                return Request.CreateErrorResponse(HttpStatusCode.NotFound, ex);
            }

            return Request.CreateResponse(HttpStatusCode.OK);
        }
        public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
        {
            if (reader.TokenType == JsonToken.Integer)
            {
                return new UberContext().ProductTypes.Find(reader.Value);
            }

            ProductType type = new ProductType();
            serializer.Populate(reader, type);

            return type;
        }
        // POST api/ProductTypes
        public HttpResponseMessage PostProductType(ProductType producttype)
        {
            if (ModelState.IsValid)
            {
                data.ProductTypes.Add(producttype);
                data.SaveChanges();

                HttpResponseMessage response = Request.CreateResponse(HttpStatusCode.Created, producttype);
                response.Headers.Location = new Uri(Url.Link("DefaultApi", new { id = producttype.Id }));
                return response;
            }
            else
            {
                return Request.CreateErrorResponse(HttpStatusCode.BadRequest, ModelState);
            }
        }