AnyPlace.MainPage.positionChanged C# (CSharp) Method

        private void positionChanged()
        {
            if (_myLatitude == 0.0 || _myLongitude == 0.0)
                return;

            if (Mymap.Layers.Contains(mypositionPoi))
            {
                Mymap.Layers.Remove(mypositionPoi);
                mypositionPoi.Clear();
            }

            if (_trackmeCheck || _first)
            {
                DrawMyPosition(_myLatitude, _myLongitude);

                if (_first)
                {
                    // center map
                    Mymap.Center.Latitude = _myLatitude;
                    Mymap.Center.Longitude = _myLongitude;
                    Mymap.SetView(Mymap.Center, 19, MapAnimationKind.Parabolic);

                }

            }

            if (Mymap.Layers.Contains(detailPois))
            {
                Mymap.Layers.Remove(detailPois);
                detailPois.Clear();
            }

            // set map view
            if (_first)
            {
                if (ContentPanel.Visibility != Visibility.Visible && gd_result.Visibility != Visibility.Visible
                    && directions_grid.Visibility != Visibility.Visible)
                    ApplicationBar.IsVisible = true;

                if (!isDownloading)
                {
                    loading.Visibility = Visibility.Collapsed;
                    loading.IsIndeterminate = false;
                }

                //var settings1 = IsolatedStorageFile.GetUserStoreForApplication();
                //if (!settings1.FileExists("WorldBuilding"))
                //{
                //    var result = MessageBox.Show("You have to download the required maps to use all the features. Download now?", "Download Required Maps", MessageBoxButton.OKCancel);

                //    if (result == MessageBoxResult.OK)
                //    {
                //        var isNetwork = NetworkInterface.GetIsNetworkAvailable();

                //        if (isNetwork)
                //        {
                //            ApplicationBar.IsVisible = false;
                //            downloading.Visibility = Visibility.Visible;
                //            DownloadRequireStaff();
                //        }
                //        else
                //            MessageBox.Show("No Internet Connection. Please check your internet connection and try again!");
                //    }
                //}


                _first = false;
            }

        }