public async Task<IHttpActionResult> PutOrder(Order order)
        {
            if (!ModelState.IsValid)
            {
                return BadRequest(ModelState);
            }

            _dbContext.ApplyChanges(order);

            try
            {
                await _dbContext.SaveChangesAsync();
            }
            catch (DbUpdateConcurrencyException)
            {
                if (!_dbContext.Orders.Any(o => o.OrderId == order.OrderId))
                {
                    return Conflict();
                }
                throw;
            }

			await _dbContext.LoadRelatedEntitiesAsync(order);
			order.AcceptChanges();
	        return Ok(order);
        }
        public async Task<IHttpActionResult> PostOrder(Order order)
        {
            if (!ModelState.IsValid)
            {
                return BadRequest(ModelState);
            }

            order.TrackingState = TrackingState.Added;
            _dbContext.ApplyChanges(order);

            await _dbContext.SaveChangesAsync();

            await _dbContext.LoadRelatedEntitiesAsync(order);
            order.AcceptChanges();
            return CreatedAtRoute("DefaultApi", new { id = order.OrderId }, order);
        }