private void CmdAdd_Click(object sender, EventArgs e)
 {
     if (txtNomRack.TextLength != 0 && numNbU.Value > 0)
     {
         GestionRack.SetRack(txtNomRack.Text, (int)numNbU.Value);
     }
     this.Close();
     this.Dispose();
 }
 private void CmdAnnuler_Click(object sender, EventArgs e)
 {
     GestionRack.SetRack("", 0);
     Close();
 }