Using CSVhelper with Dropbox - need a stream

Hi. I'm currently wanting to use https://github.com/JoshClose/CsvHelper with a Dropbox CSV file, but it takes a stream. I'm looking around but can't find anything about getting a stream (I've been using DownloadAsync to date to get files, and yet for some reason my searches aren't even bringing up the doco for that for me to refer back to!).

So from the examples, I need to change this line - 

using (var reader = new StreamReader("path\\to\\file.csv"))

to something like -

using (var reader=dropboxClient.Files.SomeDropboxAPIforFileStreams("MyDropboxFile.csv"))

Can you point me in the right direction here for whatever SomeDropboxAPIforFileStreams would be? Or some other way to achieve that?

thanks,

  Donald.