private void btnAjouter_Click(object sender, EventArgs e)
 {
     FormEvenement formEvenement = new FormEvenement();
     if (formEvenement.ShowDialog() == DialogResult.OK)
     {
         RefreshListe();
     }
 }
 private void btnModifier_Click(object sender, EventArgs e)
 {
     if (lsvEvenement.SelectedItems.Count == 1)
     {
         FormEvenement formEvenement = new FormEvenement(((Evenement)(lsvEvenement.SelectedItems[0].Tag)).Id);
         if (formEvenement.ShowDialog() == DialogResult.OK)
         {
             RefreshListe();
         }
     }
 }