New Post: Remove Background

I've seen some examples (https://magick.codeplex.com/discussions/459021 or https://magick.codeplex.com/discussions/461154) of how to remove a background but I can't seem to figure out how to remove a background using the imagemagick suggested method (http://www.imagemagick.org/Usage/masking/#bg_remove).

-alpha set -channel RGBA -fuzz 20% \
-fill none -floodfill +0+0 white \

Any help converting this command to c# would be greatly appreciated.