private void AddTroupe_Click(object sender, RoutedEventArgs e)
 {
     if(TroupeNameTxtBox.Text!=String.Empty && ShowTypeTxtBox.Text != String.Empty && MembersListView.Items.Count > 0)
     {
         newTroupe.NameTroupe = TroupeNameTxtBox.Text;
         newTroupe.ShowType = ShowTypeTxtBox.Text;
         using (var context = new CircusContext())
         {
             context.Add(newTroupe);
             context.AddRange(memberTroupes);
             context.SaveChanges();
         }
         ClearComboBox();
         MessageBox.Show("You have save your Troupe !");
     }
     else
     {
         MessageBox.Show("Have you complete all cases ?");
     }
 }