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

            if (key != student.Id)
            {
                return BadRequest();
            }

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

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

            return Updated(student);
        }
        // POST odata/Students
        public async Task<IHttpActionResult> Post(Student student)
        {
            if (!ModelState.IsValid)
            {
                return BadRequest(ModelState);
            }

            db.Students.Add(student);
            await db.SaveChangesAsync();

            return Created(student);
        }