Very frustrating trying to get the WiFiRS21 module working on my Cobra board.
The software sample at this link does not work. Lots of missing functions and objects.
http://www.ghielectronics.com/docs/105/wifi-rs21-module
For example, the WiFi_RS21.WiFiNetworkInfo[] object does not show up when I try to select this in the code.
There is also no Scan() function.
Is there changes that are not yet documented?
I have mentioned this problem as you posting here.
The document is not updated for fitting the SDK.
Many people face this problem, especially the new guys.
I told before, but the result is the same.
I think the GHI is busy in many things, so they do not have time to modify it.
However, we should have documents accompanied by corresponding SDK.
I just found other code for the Cobra 2 and it looks like this should work. 
My apologies @ Dave for the incorrect version of the SDK being referenced in the example code. We are doing an overhaul of documentation and example code. I will make sure that this link gets thrown to the top of that list.