private async void _Load(string outlet_id)
        {
            outletid = outlet_id;

            List <Room_DTO> list = new List <Room_DTO>();

            list = await RestAPI.GetRoom(outlet_id);

            list_room_current       = list;
            progress_bar.Visibility = Visibility.Collapsed;

            list_itemroom.ItemsSource = list;
        }