public IHttpActionResult PostApplicant(Application app)
        {
            if (!ModelState.IsValid)
            {
                return BadRequest(ModelState);
            }

            var applicant = new Applicant
            {
                FullName = app.FullName,
                Email = app.Email,
                PhoneNumber = app.PhoneNumber,
                IpAddress = HttpContext.Current.Request.UserHostAddress,
            };

            db.Applicants.Add(applicant);
            db.SaveChanges();

            return CreatedAtRoute("DefaultApi", new { id = applicant.Id }, applicant);
        }
        public IHttpActionResult PutApplicant(int id, Applicant applicant)
        {
            if (!ModelState.IsValid)
            {
                return BadRequest(ModelState);
            }

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

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

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

            return StatusCode(HttpStatusCode.NoContent);
        }