private void ExcluirClick(object sender, RoutedEventArgs e)
 {
     if (list.SelectedItem != null)
     {
         labs.Remove((Laboratorio)list.SelectedItem);
         LaboratorioDAL.Salvar(labs);
         AtualizarLabs();
     }
 }
 private void InserirClick(object sender, RoutedEventArgs e)
 {
     labs.Add(new Laboratorio {
         Id        = int.Parse(txtId.Text),
         Descricao = txtDesc.Text
     });
     LaboratorioDAL.Salvar(labs);
     AtualizarLabs();
 }