private void changePasswordButton_Click(object sender, System.EventArgs e) {
   using (ChangePasswordDialog dialog = new ChangePasswordDialog()) {
     dialog.ShowDialog(this);
   }
 }
 private void changePasswordButton_Click(object sender, System.EventArgs e)
 {
     using (ChangePasswordDialog dialog = new ChangePasswordDialog()) {
         dialog.ShowDialog(this);
     }
 }