The critical piece of information is that ScopeLabel is what you see as Program in the VersionOne UI. Without that knowledge, you'll search all over the developer docs and source code and you won't find what you need.
Armed with that, you would discover that ScopeLabel is not in the SDK.NET Object Model. Moreover, for the uses you are describing (like getting data for a burndown chart), you should not use the Object Model. It was designed for fine-grained access like reading and writing individual Stories. Due to the Fallacies of Distributed Computing, it performs very poorly for course-grained reporting needs.
A better starting point is the documentation on API Query for Burndown Data. You can also find some sample source code in the VersionOne OAuth2 Sample Clients on GitHub, specifically see the CSharp YamlClient. By no means is it a finished application, but it will be a much better starting point.