System Security Principal C# by API

using System;
using System.Security.Principal;
class MainClass
{
  public static void Main() 
  {
    WindowsIdentity wi = WindowsIdentity.GetCurrent();
    
    WindowsPrincipal prin = new WindowsPrincipal(wi);
    Console.WriteLine("Principal information:");
    Console.WriteLine("  Authentication Type: {0}", prin.Identity.AuthenticationType);
    Console.WriteLine("  Is authenticated: {0}", prin.Identity.IsAuthenticated);
    Console.WriteLine("  Name: {0}", prin.Identity.Name);
  }
}