public IList <string> GetUsers()
{
var result = new List <string>();
// get correct SidUserType string for Find method
var sUsers = new SecurityIdentifier(WellKnownSidType.BuiltinUsersSid, null)
.Translate(typeof(NTAccount)).ToString();
var inex = sUsers.TakeWhile(c => c != '\\').Count();
var sidTypeSubstr = sUsers.Substring(++inex);
var localMachine = new DirectoryEntry("WinNT://" + Environment.MachineName);
var usrGroup = localMachine.Children.Find(sidTypeSubstr, "group");
object members = usrGroup.Invoke("members", null);
foreach (object groupMember in (IEnumerable)members)
{
DirectoryEntry member = new DirectoryEntry(groupMember);
result.Add(member.Name);
}
return(result);
}