DevExpress' ChartControl implementation of Pie Chart Percent Demonstration Example

namespace DevExpressChart
{
    public partial class winPieSeriesView : Form
    {
        public winPieSeriesView()
        {
            InitializeComponent();
        }
        private DataTable CreateChartData()
        {
            DataTable table = new DataTable("Table1");
            ("Name", typeof(String));
            ("Value", typeof(Int32));
            (new object[] { "A", 10 });
            (new object[] { "B", 20 });
            (new object[] { "C", 40 });
            (new object[] { "D", 20 });
            (new object[] { "E", 30 });
            return table;
        }
        private void winPieSeriesView_Load(object sender, EventArgs e)
        {
            BuilderDevChart();
        }
        private void BuilderDevChart()
        {
Series _pieSeries = new Series("test", );
            _pieSeries.ValueDataMembers[0] = "Value";
            _pieSeries.ArgumentDataMember = "Name";
            _pieSeries.DataSource = CreateChartData();
            (_pieSeries);
            //----------------------------------------
            _pieSeries. = ;
            _pieSeries.SetPiePercentage();
        }
    }
}