How to check if a given user is a member of the built-in Administrators group?

Question

I need to check programmatically (in .NET) whether a given user (domain account) is a member of the built-in Administrators group on a current computer (the one where the ap

Answer 1

There is a Win32 API for this you could P/Invoke: IsUserAnAdmin

The question is more complex on Vista ... see this blog post.