So many ways to write to a file... can someone help me figure out best practice?

For simple Text, Filestream is usually a good starting point.

Stream is the abstract base class of all Streams (inlucding Filestream).You cannot instantiate it. But a lot of times a function that needs streams, could work with any stream.

Wich is best depends what you actually ahve to store. CSV data? XML? Where does the text come from? How easy is it suppsoed to be parsed when reading in?

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Let's talk about MVVM: http://social.msdn.microsoft.com/Forums/en-US/wpf/thread/b1a8bf14-4acd-4d77-9df8-bdb95b02dbe2