private void buttonX4_Click_1(object sender, EventArgs e)
        {
            frmChiTietTacGia ft = new frmChiTietTacGia();

            ft.Show();
            this.Hide();
        }
 private void buttonX4_Click_1(object sender, EventArgs e)
 {
     frmChiTietTacGia ft = new frmChiTietTacGia();
     ft.Show();
     this.Hide();
 }