public Abnormal_event()
        {
            InitializeComponent();

            Abnormal_event_ViewModel abnormal_Event_ViewModel = new Abnormal_event_ViewModel();
            List <string>            event_categorys          = abnormal_Event_ViewModel.Selectevent_category();
            List <string>            Application_unit_names   = abnormal_Event_ViewModel.SelectApplication_unit_name();

            this.cbb_category.ItemsSource         = event_categorys;
            this.cbb_application_unit.ItemsSource = Application_unit_names;
        }