public ActionResult Add(int?Id
                                , string ClassName
                                , string ListDepartmentID
                                , string Description
                                , bool Status
                                )
        {
            ClassRoomService classRoomService = new ClassRoomService();
            ClassRoom        classRoom        = classRoomService.FindByKeys(Id);

            classRoom.ClassName   = ClassName;
            classRoom.Description = Description;
            if (!string.IsNullOrEmpty(ListDepartmentID))
            {
                classRoom.DepartmentID = Convert.ToInt32(ListDepartmentID);
            }
            classRoom.Status   = Status;
            classRoom.IsDelete = false;
            if (Id.HasValue)
            {
                classRoomService.Updates(classRoom);
                setAlert("Sửa sinh vien thành công", "success");
            }
            else
            {
                classRoomService.Inserts(classRoom);
                setAlert("Thêm sinh vien thành công", "success");
            }
            return(View(classRoom));
        }