public 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 { db.SaveChanges(); } catch (DbUpdateConcurrencyException) { if (!studentExists(id)) { return(NotFound()); } else { throw; } } return(StatusCode(HttpStatusCode.NoContent)); }