private void Month_ValueChanged(object sender, RoutedPropertyChangedEventArgs<double> e)
{
Slider monthSlider = sender as Slider;
DateTime selected = new DateTime(2004, Convert.ToInt32(monthSlider.Value), 1, 0, 0, 0, DateTimeKind.Utc);
MyMap.TimeExtent.Start = selected;
MyMap.TimeExtent.End = selected;
(MyMap.Layers["ImageSrvLayer"] as ArcGISImageServiceLayer).Refresh();
}