A first chance exception of type
'System.UnauthorizedAccessException'
occurred in AccessingPictures.exe

public async void getFile()
{
    StorageFolder folder = KnownFolders.MusicLibrary;

    try
    {
        sampleFile = await folder.GetFileAsync("Test1.mp3");
    }
    catch (FileNotFoundException e)
    {
        // If file doesn't exist, indicate users to use scenario 1
        Debug.WriteLine(e);
    }
}

private void btnRead_Click(object sender, RoutedEventArgs e)
{
    getFile();
}

Void GetCameraPhotos()
      {
        using (var library = new MediaLibrary())
        {

            PictureAlbumCollection allAlbums = library.RootPictureAlbum.Albums;
            PictureAlbum cameraRoll = allAlbums.Where(album => album.Name == "Camera Roll").FirstOrDefault();
            var CameraRollPictures = cameraRoll.Pictures

        }
      }