private void buttonItem5_Click(object sender, EventArgs e)
        {
            frmDoanphi dp = new frmDoanphi();

            dp.Show();
        }
        private void quảnLýĐoànPhíToolStripMenuItem_Click(object sender, EventArgs e)
        {
            frmDoanphi DP = new frmDoanphi();

            DP.Show();
        }