private void btxoa_Click(object sender, EventArgs e)
{
GiaoVienDAL gvDAL = new GiaoVienDAL();
if (tbMagv.TextLength == 0)
{
MessageBox.Show("Chua co ma giao vien", " loi ");
}
else
{
try
{
int id = Convert.ToInt16(tbMagv.Text);
gvDAL.deleteGiaoVien(id);
dgvGiaoVien.DataSource = gvDAL.LoadDS();
}
catch
{
MessageBox.Show("ma Giao Vien khong thoa man", " loi ");
}
}
}