AppStore.AppDetailsPage.btnAppInstall_Click C# (CSharp) Method

        private void btnAppInstall_Click(object sender, RoutedEventArgs e)
        {
            if (appInstalled)
            {
                Frame.Navigate(typeof(StartPage));
            }
            else
            {
                var localSettings = Windows.Storage.ApplicationData.Current.LocalSettings;
                localSettings.Values[app.Name] = true;
                AppList.getMyAppList().myappList.Add(app);
                appInstalled = true;
                var toastTemplate = ToastTemplateType.ToastImageAndText01;
                var toastXml = ToastNotificationManager.GetTemplateContent(toastTemplate);
                var toastTextElements = toastXml.GetElementsByTagName("text");
                toastTextElements[0].AppendChild(toastXml.CreateTextNode(app.Name+" is installed."));
                var toast = new ToastNotification(toastXml);
                ToastNotificationManager.CreateToastNotifier().Show(toast);
                btnAppInstall.Content = "LAUNCH";
            }
        }