private void btThemLop_Click(object sender, EventArgs e)
{
try
{
int maHS = Convert.ToInt32(tbMaHs.Text);
int maLop = Convert.ToInt16(cbLop.SelectedValue.ToString());
HocSinhDAL hsDAL = new HocSinhDAL();
hsDAL.ThemHSLop(maHS, maLop);
HienThiDSLop();
}
catch
{
}
}
