private void cmdSave_Click(object sender, EventArgs e)
        {
            if (_formUser.VerifyPassword(txtOldPassword.Text))
            {
                if (txtNewPassword1.Text == txtNewPassword2.Text)
                {
                    _formUser.password = _formUser.Hash(txtNewPassword1.Text);
                    _formUser.Save();

                    MessageBox.Show(this, "Your new password is now saved. You can use it the next time you login.", "New password");
                    Close();
                }
                else
                {
                    MessageBox.Show(this, "Your passwords do not match.", "Passwords don't match");
                }
            }
            else
            {
                MessageBox.Show(this, "Your old password is incorrect.", "Old password wrong");
            }
        }