private void thôngTinTàiKhoảnToolStripMenuItem_Click(object sender, EventArgs e)
        {
            fStaffInfo f = new fStaffInfo(account);

            this.Hide();
            f.ShowDialog();
            this.Show();
        }
        private void bInfo_Click(object sender, EventArgs e)
        {
            fStaffInfo f = new fStaffInfo();

            this.Hide();
            f.ShowDialog();
            this.Show();
        }