private void buttonX5_Click_1(object sender, EventArgs e)
        {
            frmChiTietTheLoai ft = new frmChiTietTheLoai();

            ft.Show();
            this.Hide();
        }
 private void buttonX5_Click_1(object sender, EventArgs e)
 {
     frmChiTietTheLoai ft = new frmChiTietTheLoai();
     ft.Show();
     this.Hide();
 }