private void txtMaSach_TextChanged(object sender, EventArgs e)
{
if (SachBUS.DanhSachSachTheoMa(txtMaSach.Text).Rows.Count > 0)
{
foreach (DataRow row in SachBUS.DanhSachSachTheoMa(txtMaSach.Text).Rows)
{
txtTenSach.Text = row["TenSach"].ToString();
txtGiaBan.Text = row["GiaBan"].ToString();
}
}
else
{
txtTenSach.ResetText();
txtGiaBan.ResetText();
}
}