public IHttpActionResult PutFilm(int id, Film film)
        {
            if (!ModelState.IsValid )
            {
                return Ok(ModelState.Values);
            }

            if (id != film.FilmId)
            {
                return BadRequest();
            }

            db.Entry(film).State = EntityState.Modified;

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

            return StatusCode(HttpStatusCode.NoContent);
        }
        public IHttpActionResult PostFilm(Film film)
        {
            if (!ModelState.IsValid )
            {
                return Ok(ModelState.Values);
            }

            db.Films.Add(film);
            db.SaveChanges();

            return CreatedAtRoute("DefaultApi", new { id = film.FilmId }, film);
        }