title: Draw border around bitmap
body: <p>I have got a <code>System.Drawing.Bitmap</code> in my code.</p>
  
  <p>The width is fix, the height varies.</p>
  
  <p>What I want to do, is to add a white border around the bitmap, with about 20 pixel, to all 4 edges.</p>
  
  <p>How would this work?</p>