public IHttpActionResult PutCustomers(int id, Customers customers)
        {
            if (!ModelState.IsValid)
            {
                return BadRequest(ModelState);
            }

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

            customers.ModifiedTime = DateTime.Now;
            db.Entry(customers).State = EntityState.Modified;
            

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

            return StatusCode(HttpStatusCode.NoContent);
        }
        public IHttpActionResult GetCustomers(int id)
        {
            Customers customers = db.Customers.Find(id);
            if (customers == null)
            {
                customers = new Customers();
            }

            return Ok(customers);
        }
        public IHttpActionResult PostCustomers(Customers customers)
        {
            if (!ModelState.IsValid)
            {
                return BadRequest(ModelState);
            }

            db.Customers.Add(customers);
            db.SaveChanges();

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