private void mnuDangXuat_Click(object sender, EventArgs e)
        {
            DANGNHAP dn = new DANGNHAP();

            if (DANGNHAP.ghinhomk == true)
            {
                dn.txtPass.Text        = DANGNHAP.pass;
                dn.txtUsers.Text       = DANGNHAP.user;
                dn.ckbgn.Checked       = true;
                dn.btndangnhap.Enabled = true;
            }
            dn.Show();
            Close();
        }
        private void MAIN_FormClosed(object sender, FormClosedEventArgs e)
        {
            DANGNHAP dn = new DANGNHAP();

            if (DANGNHAP.ghinhomk == true)
            {
                dn.txtPass.Text        = DANGNHAP.pass;
                dn.txtUsers.Text       = DANGNHAP.user;
                dn.ckbgn.Checked       = true;
                dn.btndangnhap.Enabled = true;
            }
            string sql = "update TRUY_CAP set DanhmucTC = N'" + DANGNHAP.danhmuctc + "', Thaotac = N'" + DANGNHAP.thaotac + "' where IdTC = '" + DANGNHAP.matc + "'";

            Ctrl.RunSQL(sql);
            dn.Show();
        }