public static extern NtStatus SamCreateUserInDomain(
     [In] IntPtr DomainHandle,
     [In] ref UnicodeString AccountName,
     [In] SamUserAccess DesiredAccess,
     [Out] out IntPtr UserHandle,
     [Out] out int RelativeId
     );
 public static extern NtStatus SamOpenUser(
     [In] IntPtr DomainHandle,
     [In] SamUserAccess DesiredAccess,
     [In] int UserId,
     [Out] out IntPtr UserHandle
     );