private void BOK_Click(object sender, EventArgs e) { if (Verif()) { string ID = tbID.Text; string mdp = tbMDP.Text; if (Modele.verifLogin(ID, mdp)) { System.Threading.Thread t = new System.Threading.Thread(new System.Threading.ThreadStart(ThreadProc)); t.Start(); this.Close(); } else { MessageBox.Show("Login ou mdp invalide"); } } else { MessageBox.Show("ID ou MDP non remplit"); } }