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

private void Form1_Load(object sender, EventArgs e) {
    // Create a new chart.
    ChartControl stepLineChart = new ChartControl();

    // Create a step line series.
    Series series1 = new Series("Series 1", ViewType.StepLine);

    // Add points to it.
    series1.Points.Add(new SeriesPoint("A", 12));
    series1.Points.Add(new SeriesPoint("B", 4));
    series1.Points.Add(new SeriesPoint("C", 17));
    series1.Points.Add(new SeriesPoint("D", 7));
    series1.Points.Add(new SeriesPoint("E", 12));
    series1.Points.Add(new SeriesPoint("F", 4));
    series1.Points.Add(new SeriesPoint("G", 17));
    series1.Points.Add(new SeriesPoint("H", 7));

    // Add the series to the chart.
    stepLineChart.Series.Add(series1);

    // Customize the view-type-specific properties of the series.
    StepLineSeriesView myView = (StepLineSeriesView)series1.View;
    myView.LineMarkerOptions.Kind = MarkerKind.Star;
    myView.LineMarkerOptions.StarPointCount = 5;
    myView.LineStyle.DashStyle = DashStyle.Dash;

    // Access the diagram's options.
    ((XYDiagram)stepLineChart.Diagram).EnableAxisXZooming = true;

    // Hide the legend (if necessary).
    stepLineChart.Legend.Visible = false;

    // Add a title to the chart (if necessary).
    stepLineChart.Titles.Add(new ChartTitle());
    stepLineChart.Titles[0].Text = "A Step Line Chart";

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

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 a new chart.
    Dim stepLineChart As New ChartControl()

    ' Create a step line series.
    Dim series1 As New Series("Series 1", ViewType.StepLine)

    ' Add points to it.
    series1.Points.Add(New SeriesPoint("A", 12))
    series1.Points.Add(New SeriesPoint("B", 4))
    series1.Points.Add(New SeriesPoint("C", 17))
    series1.Points.Add(New SeriesPoint("D", 7))
    series1.Points.Add(New SeriesPoint("E", 12))
    series1.Points.Add(New SeriesPoint("F", 4))
    series1.Points.Add(New SeriesPoint("G", 17))
    series1.Points.Add(New SeriesPoint("H", 7))

    ' Add the series to the chart.
    stepLineChart.Series.Add(series1)

    ' Customize the view-type-specific properties of the series.
    Dim myView As StepLineSeriesView = CType(series1.View, StepLineSeriesView)
    myView.LineMarkerOptions.Kind = MarkerKind.Star
    myView.LineMarkerOptions.StarPointCount = 5
    myView.LineStyle.DashStyle = DashStyle.Dash

    ' Access the diagram's options.
    CType(stepLineChart.Diagram, XYDiagram).EnableAxisXZooming = True

    ' Hide the legend (if necessary).
    stepLineChart.Legend.Visible = False

    ' Add a title to the chart (if necessary).
    stepLineChart.Titles.Add(New ChartTitle())
    stepLineChart.Titles(0).Text = "A Step Line Chart"

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