public ActionResult EditTeacher(string id) // sửa thông tin giáo viên(lấy thông tin cũ) { if (!user.IsAdmin()) { return(View("Error")); } int id_teacher = Convert.ToInt32(id); try { teacher teacher = Model.GetTeacher(id_teacher); Model.UpdateLastSeen("Sửa Giảng Viên " + teacher.name, Url.Action("EditTeacher/" + id)); ViewBag.ListSpecialities = Model.GetSpecialities(); return(View(teacher)); } catch (Exception) { return(View("Error")); } }