title: How do I draw a drop shadow in the shape of a System.Drawing.Bitmap?
body: <p>Our app has a very large number of <code>System.Drawing.Bitmap</code>s that are to be displayed with drop shadows.  What's a quick way of drawing drop shadows, with a given blur radius and colour?  It's a winforms app, no WPF.  p/invoke preferred to unsafe code, but ideally neither; third-party libraries not allowed.</p>
  
  <p>I've seen the 'Image Processing for Dummies' tutorial but it uses unsafe code.</p>