Main Page Code Behind

MainPage.XAML.cs

public MainPage()
{
    InitializeComponent();
    this.Loaded += MainPage_Loaded;
}

void MainPage_Loaded(object sender, RoutedEventArgs e)
{
    ChartServiceClient client = new ChartServiceClient();
    client.GetTop10ProductsCompleted += client_GetTop10ProductsCompleted;
    client.GetTop10ProductsAsync();
}

void client_GetTop10ProductsCompleted(object sender, GetTop10ProductsCompletedEventArgs e)
{
    var data = e.Result;
    this.chartView.Series[0].DataContext = data;
}