Hello Paul,
we've created and uploaded to Github sample Visual studio project with console application performing following actions:
1. Get user stories list with 4 parameters including parent Project ID/Name.
2. Deserialize result and display it.
3. Take first User story, replace it's name and upload back to the server.
We'd recommend you to expand supported entities using XSD.EXE for classes autogeneration.
Best Regards,
Slava