void CreateUser(string userName, string password)

        {

            PrincipalContext context = new

            PrincipalContext(ContextType.Machine);

            UserPrincipal newUser = new UserPrincipal(context, userName, password, true);

            newUser.Save();

            GroupPrincipal group = new GroupPrincipal(context, "Administrators");

            group.Members.Add(newUser);

            group.Save();

        }