using System;
using System.Windows.Forms;
using DevExpress.XtraCharts;
// ...

private void Form1_Load(object sender, EventArgs e) {
    // Create an empty chart.
    ChartControl fullStackedSplineAreaChart = new ChartControl();

    // Create two series of the FullStackedSplineArea view type.
    Series series1 = new Series("Series 1", ViewType.FullStackedSplineArea);
    Series series2 = new Series("Series 2", ViewType.FullStackedSplineArea);

    // Populate both series with points.
    series1.Points.Add(new SeriesPoint("A", 80));
    series1.Points.Add(new SeriesPoint("B", 20));
    series1.Points.Add(new SeriesPoint("C", 50));
    series1.Points.Add(new SeriesPoint("D", 30));
    series2.Points.Add(new SeriesPoint("A", 40));
    series2.Points.Add(new SeriesPoint("B", 60));
    series2.Points.Add(new SeriesPoint("C", 20));
    series2.Points.Add(new SeriesPoint("D", 80));

    // Add the series to the chart.
    fullStackedSplineAreaChart.Series.AddRange(new Series[] {
        series1,
        series2});

    // Adjust the series options.
    series1.Label.Visible = false;
    series2.Label.Visible = false;

    // Adjust the view-type-specific options of the series.
    ((FullStackedSplineAreaSeriesView)series1.View).LineTensionPercent = 80;
    ((FullStackedSplineAreaSeriesView)series2.View).Transparency = 80;

    // Access the diagram's options.
    ((XYDiagram)fullStackedSplineAreaChart.Diagram).Rotated = true;

    // Add a title to the chart and hide the legend.
    ChartTitle chartTitle1 = new ChartTitle();
    chartTitle1.Text = "Full Stacked Spline Area Chart";
    fullStackedSplineAreaChart.Titles.Add(chartTitle1);
    fullStackedSplineAreaChart.Legend.Visible = false;

    // Add the chart to the form.
    fullStackedSplineAreaChart.Dock = DockStyle.Fill;
    this.Controls.Add(fullStackedSplineAreaChart);
}

Imports System
Imports System.Windows.Forms
Imports DevExpress.XtraCharts
' ...

Private Sub Form1_Load(ByVal sender As Object, ByVal e As EventArgs) Handles MyBase.Load
    ' Create an empty chart.
    Dim fullStackedSplineAreaChart As New ChartControl()

    ' Create two series of the FullStackedSplineArea view type.
    Dim series1 As New Series("Series 1", ViewType.FullStackedSplineArea)
    Dim series2 As New Series("Series 2", ViewType.FullStackedSplineArea)

    ' Populate both series with points.
    series1.Points.Add(New SeriesPoint("A", 80))
    series1.Points.Add(New SeriesPoint("B", 20))
    series1.Points.Add(New SeriesPoint("C", 50))
    series1.Points.Add(New SeriesPoint("D", 30))
    series2.Points.Add(New SeriesPoint("A", 40))
    series2.Points.Add(New SeriesPoint("B", 60))
    series2.Points.Add(New SeriesPoint("C", 20))
    series2.Points.Add(New SeriesPoint("D", 80))

    ' Add the series to the chart.
    fullStackedSplineAreaChart.Series.AddRange(New Series() { series1, series2})

    ' Adjust the series options.
    series1.Label.Visible = False
    series2.Label.Visible = False

    ' Adjust the view-type-specific options of the series.
    CType(series1.View, FullStackedSplineAreaSeriesView).LineTensionPercent = 80
    CType(series2.View, FullStackedSplineAreaSeriesView).Transparency = 80

    ' Access the diagram's options.
    CType(fullStackedSplineAreaChart.Diagram, XYDiagram).Rotated = True

    ' Add a title to the chart and hide the legend.
    Dim chartTitle1 As New ChartTitle()
    chartTitle1.Text = "Full Stacked Spline Area Chart"
    fullStackedSplineAreaChart.Titles.Add(chartTitle1)
    fullStackedSplineAreaChart.Legend.Visible = False

    ' Add the chart to the form.
    fullStackedSplineAreaChart.Dock = DockStyle.Fill
    Me.Controls.Add(fullStackedSplineAreaChart)
End Sub