public IHttpActionResult PutTeacher(string id, TeacherDTO teacher) { if (!ModelState.IsValid) { return(BadRequest(ModelState)); } if (id != teacher.TeacherId) { return(BadRequest()); } try { bizTeacher.updateTeacher(teacher); } catch (DbUpdateConcurrencyException) { if (!TeacherExists(id)) { return(NotFound()); } else { throw; } } return(StatusCode(HttpStatusCode.NoContent)); }