public JsonResult DeleteClassroom(int id)
        {
            var classroom = _classroomService.GetClassroomById(id);

            classroom.IsDeleted = true;
            if (classroom == null)
            {
                return(Json(false, JsonRequestBehavior.AllowGet));
            }
            _classroomService.UpdateClassroom(classroom);
            return(Json(true, JsonRequestBehavior.AllowGet));
        }