// Private Method
        private static void EnableADUserUsingUserPrincipal(string username)
        {
            try
            {
                PrincipalContext principalContext = new PrincipalContext(ContextType.Domain);
                UserPrincipal userPrincipal = UserPrincipal.FindByIdentity
                (principalContext, username);
                userPrincipal.Enabled = true;
                userPrincipal.Save();
                MessageBox.Show("AD Account Enabled for {0}", username);
                Form1 f1 = new Form1();
                f1.StatusTextBox.Text = "Account Enabled";

            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
            }
        }