partial void CalculateBtn_TouchUpInside(UIButton sender)
{
ResultLabel.ResignFirstResponder();
double montant = 0;
double.TryParse(Build.Text, out montant);
double tipPercent = (10f + (TipPercentSegment.SelectedSegment * 5)) / 100f;
double tips = montant * tipPercent;
MesTips.Add(tips);
ResultLabel.Text = string.Format("le pourboire est de {0:C}", tips);
}
