capture from screen

Jun 19, 2013 at 10:11 AM
hello, thanks everybody for this excellent work, and support.
I'm a little confuse about it:
I want to capture the video of the computer screen.
the ffmpeg command I want to use is:

ffmpeg -f dshow -i video=UScreenCapture -t 8 -r 3 -vf scale=iw/2:-1 -b 100k -v 0 output.avi

how should I configure the vbnet parameters to replicate this dos command?
newcoder.SourceFile ?
newcoder.CustomParams ?
newcoder.VideoBitrate ?

I'm stuck on this so, please any suggestion will be appreciated.
thanks again,