public int CreateProduct([FromODataUri] int key, ODataActionParameters parameters) { if (!ModelState.IsValid) { throw new HttpResponseException(Request.CreateODataErrorResponse(HttpStatusCode.BadRequest, new ODataError() { Message = ODataHelper.GetModelStateErrorInformation(ModelState) })); } ProductFamily productFamily = _db.ProductFamilies.SingleOrDefault(p => p.ID == key); string productName = parameters["Name"].ToString(); Product product = new Product { Name = productName, Family = productFamily, ReleaseDate = DateTime.Now, SupportedUntil = DateTime.Now.AddYears(10) }; _db.Products.Add(product); _db.SaveChanges(); return(product.ID); }