private void btXoa_Click(object sender, EventArgs e)
{
HocSinhDAL hsDAL = new HocSinhDAL();
if (tbMaHs.TextLength == 0)
{
MessageBox.Show("Chua co ma hoc sinh", " loi ");
}
else
{
try
{
int id = Convert.ToInt16(tbMaHs.Text);
hsDAL.deleteHocSinh(id);
dgvHocSinh.DataSource = hsDAL.LoadDS();
}
catch
{
MessageBox.Show("ma hoc sinh khong thoa man", " loi ");
}
}
}