C# access user roles

Question

In a C# 2008 desktop application, I need change the application since all the users are moving from one domain to new domain. The current application does not let the user access information under the new domain name.
To accomplish this goal, I would like to see what roles have been setup for those users starting with myself.
To accomplish this goal, I would like to know how to access those roles.
I do know that when I look at: Thread.CurrentPrincipal.Identity.Name, I can access the person's name. I also know that if I use System.Security.Principal.WindowsIdentity.GetCurrent(), I get the same information.
However can you tell me in code how to access the subcategories in the following:
1. Thread.CurrentPrincipal.Identity
2. System.Security.Principal.WindowsIdentity
Can you tell me in tell or show me in code how to accomplish this goal?

Vulpes · Accepted Answer

As far as Thread.CurrentPrincipal.Identity is concerned, you can only find out whether a user belongs to a specified role.
For example:
IPrincipal ip = Thread.CurrentPrincipal;   bool isInRole = ip.IsInRole("managers"); // say
With regard to System.Security.Principal.WindowsIdentity, you can get a list of groups (which I think will include roles) for the current user as follows:
using System.Security.Principal;
// ...
List groups = new List (); WindowsIdentity wi = WindowsIdentity.GetCurrent(); IdentityReferenceCollection irc = wi.Groups;
foreach (IdentityReference ir in irc) {   string group = ir.Translate(typeof(NTAccount)).Value;   groups.Add(group);   Console.WriteLine(group); }