System Security Principal C# by API

using System;
using System.Security.Principal;
class MainClass
{
  public static void Main() 
  {
    WindowsIdentity wi = WindowsIdentity.GetCurrent();
    Console.WriteLine("Identity information:");
    Console.WriteLine("  Authentication Type: {0}",wi.AuthenticationType);
    Console.WriteLine("  Is Anonymous: {0}", wi.IsAnonymous);
    Console.WriteLine("  Is Authenticated: {0}", wi.IsAuthenticated);
    Console.WriteLine("  Is Guest: {0}", wi.IsGuest);
    Console.WriteLine("  Is System: {0}", wi.IsSystem);
    Console.WriteLine("  Name: {0}", wi.Name);
    Console.WriteLine("  Token: {0}", wi.Token);
  }
}