Blog post author here. I added a note on my post indicating the code is licensed under [CC](http://creativecommons.org/licenses/by-sa/3.0/), same as StackOverflow, so feel free to use it if you like.

See post [here](http://tmont.com/blargh/2011/3/determining-if-an-open-generic-type-isassignablefrom-a-type).