title: How to copy a System.Drawing.Image value?
body: <p>I am trying to copy an Image value to draw on it and on second draw ignore the last one and start over on top of the preserved Image value. I.e.:</p>
  
  <pre><code>Image with 4 rectangle (ImageA)
  -&gt; draw a circle
  return to ImageA
  -&gt; draw a rectangle
  now there are 5 rectangles
  </code></pre>
  
  <p>I don't know if it's the optimal way to draw too?</p>