public async Task<IHttpActionResult> PutStudent(int id, Student student)
        {
            if (!ModelState.IsValid)
            {
                return BadRequest(ModelState);
            }

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

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

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

            return StatusCode(HttpStatusCode.NoContent);
        }
        public async Task<IHttpActionResult> PostStudent(Student student)
        {
            if (!ModelState.IsValid)
            {
                return BadRequest(ModelState);
            }

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

            db.Entry(student).Reference(x => x.Department).Load();

            var dto = new StudentDTO()
            {
                Id = student.Id,
                FirstName = student.FirstName,
                DepartmentName = student.Department.Name
            };

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