title: Working with large bitmaps causes Out of Memory Exception
body: <p>I need to edit(Increase the height) the Image on the fly.
  The file is mostly 5000*4000 in dimension. I see the memory shoots up to peak level when I create a bmp of large dimensions and call Graphics.DrawImage method on the bmp instance.</p>
  
  <p>How do I get rid of the Out Of Memory exception? Is there a way to work with large bitmaps in c# ?</p>