public IHttpActionResult PostCustomer([FromBody] CustomerDto customerDto)
        {
            if (!ModelState.IsValid)
            {
                return(BadRequest(ModelState));
            }

            var customer = CustomerDto.ConvertToModel(customerDto);

            customer.DateOfBirth = DateTime.Now;
            _db.Customers.Add(customer);
            _db.SaveChanges();

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