private void btnQuanLyDocGia_Click(object sender, EventArgs e)
 {
     QuanLyDocGia fm = new QuanLyDocGia();
     fm.ShowDialog();
 }
        private void btnQuanLyDocGia_Click(object sender, EventArgs e)
        {
            QuanLyDocGia fm = new QuanLyDocGia();

            fm.ShowDialog();
        }