DIRECT X 10 application (as proof of concept)

I need some a DIRECT X 10 application (as proof of concept) and answers in order to clarify some problems regarding : - render offscreen with antialiasing ( and what antialiasing types are supported ? differences agaist DirectX 9 ? ) - resize of the offscreen surface (what resize types are suported ? differences agaist DirectX 9 ? ) - copy from offscreen surface to main memory frame by frame (is there a better way agaist DX 9 ? ) - is there any chance to lost device render when changing resolution or entering in screen saver ( differences agaist DirectX 9 ? )