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A:
Using the ToEpub(String, String) function, the first parameter can be a path to a XPS file (or any other supported file format).
For supported file types, see the convert add-on section in the feature page(http://www.pdftron.com/pdfnet/features.html).
To convert arbitrary files, see this forum posting:
https://groups.google.com/forum/?fromgroups#!searchin/pdfnet-sdk/dwg/pdfnet-sdk/ovStpU-HGYk/s-PMo7sGMT8J