// POST odata/Orders
        public IHttpActionResult Post(Order order)
        {
            if (!ModelState.IsValid)
            {
                return BadRequest(ModelState);
            }

            db.Orders.Add(order);
            db.SaveChanges();

            return Created(order);
        }
        // PUT odata/Orders(5)
        public IHttpActionResult Put([FromODataUri] int key, Order order)
        {
            if (!ModelState.IsValid)
            {
                return BadRequest(ModelState);
            }

            if (key != order.OrderId)
            {
                return BadRequest();
            }

            db.Entry(order).State = EntityState.Modified;

            try
            {
                db.SaveChanges();
            }
            catch (DbUpdateConcurrencyException)
            {
                if (!OrderExists(key))
                {
                    return NotFound();
                }
                else
                {
                    throw;
                }
            }

            return Updated(order);
        }