c# capture scrolling window image

Looking for a c# class that will allow me to capture any scrolling window in Microsoft Windows and return an image.? Requirements. 1. Scrolling command window. 2. Scrolling windows explorer window. 3. Scrolling Internet explorer window. 4. Support for most popular web browsers. Must capture entire image and must work all the time not like some capture that work about half of the time.? Experience with this type of screen capture is recommended.