public IHttpActionResult PostCustomer(Customer customer)
        {
            if (!ModelState.IsValid)
            {
                return(BadRequest(ModelState));
            }

            if (custService.AddCustomer(customer))
            {
                return(CreatedAtRoute("DefaultApi", new { id = customer.CustomerId }, customer));
            }
            else
            {
                return(Conflict());
            }
        }