How to get the SID of the current user?

Question

Windows

How to get the SID (the same Windows security identifier) ​​of the current user?
Well, immediately the second question: how unique can this identifier be, say, in the network of a small enterprise?

Answer 1

using System.Security.Principal;
...
string sid = WindowsIdentity.GetCurrent().User.Value;

Answer 2

On the command line: wmic useraccount get name,sid
Or wmic useraccount where name='username' get sid Sids
are unique within the issuing environment. The local user sid is unique within the computer, the domain sid is unique within the domain. At the same time, both the computer and the domain have their own sids. You should not worry about their repetition, this is the concern of ms and windows ;-)