title: Extract sub image from an Image using c#
body: <p>I have a Bitmap object from this I need to extract a sub image and keep it as a Bitmap object by passing Rectangle object which contains sub image co-ordinates? </p>
  
  <p>Is there a c# library which is able to do this or is Aforge able to extract sub image.</p>
  
  <p>Thanks </p>