private void button1_Click(object sender, EventArgs e) { try { if (comboBox1.ToString() != "") { string AVG = ""; ModeleBDD con = new ModeleBDD(); Clubs leclub = new Clubs(); leclub.setNom(comboBox1.ToString()); AVG = con.AVGCotisation(leclub); } } catch (Exception n) { MessageBox.Show("Message d'erreur : " + n.Message + " \nType de l'exception " + n.GetType() + " \nPile d'appel" + n.StackTrace); } }