Scrolling ScrollViewer with Mouse Wheel in Silverlight 3

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1. scrollViewer1.MouseWheel += delegate(object sender, MouseWheelEventArgs e)  
2. {  
3.   scrollViewer1.ScrollToVerticalOffset(scrollViewer1.VerticalOffset - e.Delta);  
4. };  

scrollViewer1.MouseWheel += delegate(object sender, MouseWheelEventArgs e)
{
  scrollViewer1.ScrollToVerticalOffset(scrollViewer1.VerticalOffset - e.Delta);
};