Get listings of all domains

I have a question that is an extension of the following question:
https://www.experts-exchange.com/questions/20441806/Help-with-code-to-Enumerate-server-list-on-local-default-or-other-domains-Help.html

Basically,

Is there any way I can get a listing of all the domains available on my LAN? I would like to use the code in the previous link, but I don't want the user to have to know the domains. I need for them to choose the correct one from a drop down list.

I am going out of town until wen. I will check this when I get back.

Thanks in advance..