private void button3_Click(object sender, EventArgs e)
{
try
{
Niveaus clt = NiveauDAO.Get_client_ID(int.Parse(tbID.Text));
tbnom.Text = clt.nom;
tbngr.Text = clt.nbre_gr.ToString();
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}