How capturing a selected area from the screen with Wpf C#

I would like my Wpf c# application to be able to capture any rectanglar area on the screen as an image. the selection could be performed via a rectangle that the user can draw with the mouse.
The  capturing of this area should be done while my application is transparent so I can have a visual access to other windows...
Please help!
bish wakimAsked:
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Mike TomlinsonMiddle School Assistant TeacherCommented:
You have Silverlight listed as a this an XBAP or just a regular WPF app?
bish wakimAuthor Commented:
This is a regular WPF

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bish wakimAuthor Commented:
Yes. I could find a good code for copying an area from the screen into a bitmap . Still the second part of my question. How Can I within my wpf application go to any window (not necessary in my project) and
select a rectanglar area  and retrieve the the four coordinations of this area in order to copy the image
inside it.  
bish wakimAuthor Commented:
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