public HttpResponseMessage ChangePayment(HttpRequestMessage request, int id, int productID) { return(CreateHttpResponse(request, () => { HttpResponseMessage response = null; if (!ModelState.IsValid) { request.CreateErrorResponse(HttpStatusCode.BadRequest, ModelState); } else { var status = _orderDetailService.ChangePayment(id, productID); response = request.CreateResponse(HttpStatusCode.OK, status); } return response; })); }