public async Task<IHttpActionResult> PostStudentRegistration(StudentRegistration studentRegistration)
        {
            if (!ModelState.IsValid)
            {
                return BadRequest(ModelState);
            }

            db.StudentRegistrations.Add(studentRegistration);

            try
            {
                await db.SaveChangesAsync();
            }
            catch (DbUpdateException)
            {
                if (StudentRegistrationExists(studentRegistration.Id))
                {
                    return Conflict();
                }
                else
                {
                    throw;
                }
            }

            return CreatedAtRoute("DefaultApi", new { id = studentRegistration.Id }, studentRegistration);
        }
        public async Task<IHttpActionResult> PutStudentRegistration(int id, StudentRegistration studentRegistration)
        {
            if (!ModelState.IsValid)
            {
                return BadRequest(ModelState);
            }

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

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

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

            return StatusCode(HttpStatusCode.NoContent);
        }