application C# Metro Style

 private async void ButtonLoad_Click(object sender, RoutedEventArgs e)
        {
            /* he probado de todas las maneras posibles y no funciona con metodos page_loaded, LayoutRoot_Loaded eso es
             *
            StorageFolder folder = KnownFolders.DocumentsLibrary;
            IReadOnlyList<StorageFile> files = await folder.GetFilesAsync();
            foreach (StorageFile file in files)
            {
                // Do something with file
                string path = file.Path;
            }*/
            StorageFolder storageFolder = KnownFolders.DocumentsLibrary;
            IReadOnlyList<StorageFile> listFiles = await storageFolder.GetFilesAsync();
            int countFiles = listFiles.Count;
            int i = 0;
            int indice = 0;
            while (i < countFiles)
            {
                StorageFile file = listFiles.ElementAt(indice);
                string path = file.Path;
                ListBoxFiles.Items.Add(path);

            }

        }