using System;
using System.Collections.Generic;
using System.IO;
using System.IO.IsolatedStorage;
using System.Net;
using System.Net.Sockets;
using System.Reflection;
using System.Security;
using System.Security.AccessControl;
using System.Security.Policy;
using System.Security.Permissions;
using System.Security.Principal;
using System.Text;
public class MainClass
{
public static void Main()
{
WindowsIdentity identity = WindowsIdentity.GetCurrent();
WindowsImpersonationContext context = identity.Impersonate();
context.Undo();
}
}