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");
         //}
     }
 }