private void button26_Click(object sender, EventArgs e)
        {
            fPhanQuyen f = new fPhanQuyen();

            f.ShowDialog();
        }
        private void phânQuềnToolStripMenuItem_Click(object sender, EventArgs e)
        {
            fPhanQuyen fPhanQuyen = new fPhanQuyen();

            fPhanQuyen.ShowDialog();
        }