Question

Once a user is logged into a Windows-Authentication site, how do I get their Active Directoy user guid from the User.

Eg in an Action:

ViewBag.Message = User.Identity.GUID????

Answer 1

You should check out the System.DirectoryServices.AccountManagement (S.DS.AM) namespace. Read all about it here:

• Managing Directory Security Principals in the .NET Framework 3.5
• MSDN docs on System.DirectoryServices.AccountManagement

Basically, you can define a domain context and easily find users and/or groups in AD:

// set up domain context
PrincipalContext ctx = new PrincipalContext(ContextType.Domain);

// find the current user
UserPrincipal user = UserPrincipal.Current;

if(user != null)
{
   // get guid
   var userGuid = user.Guid;
}

The new S.DS.AM makes it really easy to play around with users and groups in AD!