private void FrmSuaSach_Load(object sender, EventArgs e)
{
DataTable tb = Sach_DAO.TimKiemSach("where MaSach=" + MaSach.Trim());
txtMasach.Text = tb.Rows[0]["MaSach"].ToString();
txtMasach.ReadOnly = true;
txtTensach.Text = tb.Rows[0]["TenSach"].ToString();
txtGiaban.Text = tb.Rows[0]["GiaBan"].ToString();
txtMota.Text = tb.Rows[0]["MoTa"].ToString();
txtNgaynhap.Text = tb.Rows[0]["NgayNhap"].ToString();
txtSoluong.Text = tb.Rows[0]["SoLuong"].ToString();
txtMaCD.Text = tb.Rows[0]["MaCD"].ToString();
txtMaCD.ReadOnly = true;
txtMaNXB.Text = tb.Rows[0]["MaNXB"].ToString();
txtMaNXB.ReadOnly = true;
}