I've included Xpath. In my references (2 kinds of references I think there are, and I included this this w/e-ness in both.)
I try to make an object and it's not recognizing the class...
BTW, it's not like my job depends on this or anything, I'm just saying I might go insane if I don't get this to work. This C Sharp business is pushing me over the edge, I have no idea why it's so hard to get these things to connect.
Re: Why am I not able to start using XPath for XML?
You need to add the reference to your project. The Add Reference dialog Recent tab that is in your screen shot doesn't mean those references have been added to your project - those are only references that have been used recently.
To see which references are in your project, open the Solution Explorer and expland the 'References' node.