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        private void btn_Activate_Click(object sender, RoutedEventArgs e)
        {
            Timer timer1 = new Timer(new TimerCallback(loadImage), null, 0, 100);
        }

        public void loadImage(object a)
        {
            BitmapImage bi3 = new BitmapImage();  <!--- //Fehler hier
            bi3.CreateOptions = BitmapCreateOptions.IgnoreImageCache;
            bi3.UriSource = new Uri("smile.jpg", UriKind.RelativeOrAbsolute);
            Image1.Source = bi3;
        }					

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private void btn_Activate_Click(object sender, RoutedEventArgs e)
{
    DispatcherTimer _Timer = new DispatcherTimer();
    _Timer.Interval = new TimeSpan(0,0,0,0,100);
    _Timer.Tick += (s, i) =>
        {
            BitmapImage bi3 = new BitmapImage();
            bi3.CreateOptions = BitmapCreateOptions.IgnoreImageCache;
            bi3.UriSource = new Uri("smile.jpg", UriKind.RelativeOrAbsolute);
            Image1.Source = bi3;
        };
    _Timer.Start();
}