Starting from v6.0 DataObjects.Net is publicly available on Github so you can post questions there. In case you want to participate with new ideas, actual improvements or bug reports or suggested fixes you can also open an issue and we'll disscuss it and probably make your changes part of future release.
Forum is more for DataObjects.Net v5 and older versions. Try searching or ask question there. The forum is maintained by our developers along with the community from all over the world, so the response time is usually short.
If you want to write us directly DataObjects.Net team is available via e-mail as well. Contact firstname.lastname@example.org if previous options is not convenient for you due to any reason.