public IHttpActionResult PutCustomer(int id, Customer customer)
        {
            if (!ModelState.IsValid)
            {
                return BadRequest(ModelState);
            }

            if (id != customer.Id)
            {
                return BadRequest();
            }

            try
            {
                rep.Update(id, customer);
            }
            catch (DbUpdateConcurrencyException)
            {
                if (!rep.CustomerExists(id))
                {
                    return NotFound();
                }
                else
                {
                    throw;
                }
            }

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

            rep.Add(customer);

            return CreatedAtRoute("DefaultApi", new { id = customer.Id }, customer);
        }