using System;
using System.Security;
using System.Security.Principal;
using System.Threading;

class Starter
{
	public static void Main()
	{
		Thread.GetDomain().SetPrincipalPolicy(
			PrincipalPolicy.WindowsPrincipal);
		IPrincipal p=Thread.CurrentPrincipal;
		PrincipalType(p);
		Console.WriteLine(p.Identity.Name); 
		
		Thread.GetDomain().SetPrincipalPolicy(
			PrincipalPolicy.UnauthenticatedPrincipal);
		p=Thread.CurrentPrincipal;
		PrincipalType(p);
		Console.WriteLine(p.Identity.Name); 
								
		Thread.GetDomain().SetPrincipalPolicy(
			PrincipalPolicy.NoPrincipal);
		p=Thread.CurrentPrincipal;
		PrincipalType(p);
		Console.WriteLine(p.Identity.Name);
	}

	public static void PrincipalType(IPrincipal p)
	{
		if(p is WindowsPrincipal)
			Console.WriteLine("\nWindows Principal");
		else if(p is GenericPrincipal)
			Console.WriteLine("\nGeneric Principal");
		else 
			Console.WriteLine("\nNo principal");
	}
}