How to detect if machine is joined to domain?

Question

How do I detect whether the machine is joined to an Active Directory domain (versus in Workgroup mode)?

Answer 1

The Environment variables could work for you.

Environment.UserDomainName

MSDN Link for some more details.

Environment.GetEnvironmentVariable("USERDNSDOMAIN")

I'm not sure this environment variable exists without being in a domain.

Correct me if I'm wrong Windows Admin geeks -- I believe a computer can be in several domains so it may be more important to know what domain, if any, you are in instead of it being in any domain.