AnyPlace.MainPage.btn_builddown_Click C# (CSharp) Method

        private async void btn_builddown_Click(object sender, RoutedEventArgs e)
        {
            downloading.Visibility = Visibility.Visible;
            try
            {
                var worldbuildings1 = await CustomPushpinWp8APIClient.GetWorldBuildings();
                foreach (var obj in worldbuildings1.buildings)
                {
                    var building = await CustomPushpinWp8APIClient.GetPoisByBuilding(obj.buid);
                    //_poisByBuilding.Add(building);
                }
            }
            catch
            {
                downloading.Visibility = Visibility.Collapsed;
                MessageBox.Show("Can not load floor pois. Please check your connection and try again!");
            }
            downloading.Visibility = Visibility.Collapsed;
        }