private void pct_Connexion_Click(object sender, EventArgs e) { //Create your domain context //using (PrincipalContext domain = new PrincipalContext(ContextType.Domain)) { //If connection is correct //bool connected = domain.ValidateCredentials(txt_Login.Text, txt_Password.Text); //if (connected){ MessageBox.Show("Connecté"); Connected frm_Connected = new Connected(); frm_Connected.ShowDialog(); //} //else{ // MessageBox.Show("Impossible de se connecter"); //} } }