// PUT: odata/CandidatesApi(5)
        public async Task<IHttpActionResult> Put([FromODataUri] int key, Candidate candidate)
        {
            if (!ModelState.IsValid)
            {
                return BadRequest(ModelState);
            }

            if (key != candidate.ID)
            {
                return BadRequest();
            }

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

            try
            {
                await db.SaveChangesAsync();
            }
            catch (DbUpdateConcurrencyException)
            {
                if (!CandidateExists(key))
                {
                    return NotFound();
                }
                else
                {
                    throw;
                }
            }

            return Updated(candidate);
        }
        // POST: odata/CandidatesApi
        public async Task<IHttpActionResult> Post(Candidate candidate)
        {
            if (!ModelState.IsValid)
            {
                return BadRequest(ModelState);
            }

            db.Candidates.Add(candidate);
            await db.SaveChangesAsync();

            return Created(candidate);
        }