(Form1.cs)
using System;
using System.Drawing;
using System.Windows.Forms;
using DevExpress.XtraCharts;
// ...

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

    // Create a stock series, add it to the chart and set its properties.
    Series series1 = new Series("Series 1", ViewType.Stock);
    stockChart.Series.Add(series1);
    series1.ArgumentScaleType = ScaleType.DateTime;
    series1.ValueScaleType = ScaleType.Numerical;

    // Add points to the series.
    series1.Points.Add(new SeriesPoint(new DateTime(1994, 3, 1),
        new object[] { 4.00, 5.00, 5.00, 4.85 }));
    series1.Points.Add(new SeriesPoint(new DateTime(1994, 3, 2),
        new object[] { 6.05, 8.05, 6.05, 7.05 }));
    series1.Points.Add(new SeriesPoint(new DateTime(1994, 3, 3),
        new object[] { 6.25, 8.25, 6.75, 7.15 }));

    // Create and customize a trendline, 
    TrendLine trendline1 = new TrendLine("A Trend");
    trendline1.Point1.Argument = new DateTime(1994, 3, 1);
    trendline1.Point1.ValueLevel = ValueLevel.High;
    trendline1.Point2.Argument = new DateTime(1994, 3, 3);
    trendline1.Point2.ValueLevel = ValueLevel.High;
    trendline1.ExtrapolateToInfinity = false;
    trendline1.Color = Color.Red;
    trendline1.LineStyle.DashStyle = DashStyle.Dash;


    // Cast the view type of the series to the Stock view.
    StockSeriesView myView = ((StockSeriesView)series1.View);

    // Define the Y-axis range.
    myView.AxisY.Range.AlwaysShowZeroLevel = false;

    // Add the trendline to the series collection of indicators.
    myView.Indicators.Add(trendline1);

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

 (Form1.vb)
Imports System
Imports System.Drawing
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 stockChart As New ChartControl()

    ' Create a stock series, add it to the chart and set its properties.
    Dim series1 As New Series("Series 1", ViewType.Stock)
    stockChart.Series.Add(series1)
    series1.ArgumentScaleType = ScaleType.DateTime
    series1.ValueScaleType = ScaleType.Numerical

    ' Add points to the series.
    series1.Points.Add(New SeriesPoint(New DateTime(1994, 3, 1), _ 
    New Object() { 4.00, 5.00, 5.00, 4.85 }))
    series1.Points.Add(New SeriesPoint(New DateTime(1994, 3, 2), _ 
    New Object() { 6.05, 8.05, 6.05, 7.05 }))
    series1.Points.Add(New SeriesPoint(New DateTime(1994, 3, 3), _ 
    New Object() { 6.25, 8.25, 6.75, 7.15 }))

    ' Create and customize a trendline, 
    Dim trendline1 As New TrendLine("A Trend")
    trendline1.Point1.Argument = New DateTime(1994, 3, 1)
    trendline1.Point1.ValueLevel = ValueLevel.High
    trendline1.Point2.Argument = New DateTime(1994, 3, 3)
    trendline1.Point2.ValueLevel = ValueLevel.High
    trendline1.ExtrapolateToInfinity = False
    trendline1.Color = Color.Red
    trendline1.LineStyle.DashStyle = DashStyle.Dash


    ' Cast the view type of the series to the Stock view.
    Dim myView As StockSeriesView = (CType(series1.View, StockSeriesView))

    ' Define the Y-axis range.
    myView.AxisY.Range.AlwaysShowZeroLevel = False

    ' Add the trendline to the series collection of indicators.
    myView.Indicators.Add(trendline1)

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