private void LoadBarChartData()
{
List <PersonelStat> v = new List <PersonelStat>();
List <Personel> ls = Requettes.getAllPersonels();
for (int i = 0; i < ls.Count; i++)
{
v.Add(new PersonelStat(ls.ElementAt(i).nom, Requettes.nbApparenceJournal(ls.ElementAt(i).id)));
}
((BarSeries)mcChart.Series[0]).ItemsSource = v;
}