private void fillChart()
{
int nbEtds = ManagerDB.getNbEtds();
ObservableCollection <Plotinfo> plotinfos = new ObservableCollection <Plotinfo>();
foreach (Filiere f in cl.Filieres)
{
string x = f.Nom_filiere;
int y = ManagerDB.nbEtdParFil(f.Id_filiere);
double z = Convert.ToDouble(y) / nbEtds;
plotinfos.Add(new Plotinfo(x, y, z * 100));
}
barSeries.ItemsSource = plotinfos;
}