Charts for WinForms - How to Add a Trend Line to a Chart

C#
#region #usings
using System;
using System.Drawing;
using System.Windows.Forms;
using DevExpress.XtraCharts;
// ...
#endregion #usings

namespace TrendLines {
    public partial class Form1 : Form {
        public Form1 () {
            InitializeComponent();
        }

        #region #code
        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.WholeRange.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);
        }
        #endregion #code

    }
}

Visual Basic
'#Region "#usings"
Imports System
Imports System.Drawing
Imports System.Windows.Forms
Imports DevExpress.XtraCharts

' ...
'#End Region  ' #usings
Namespace TrendLines

    Public Partial Class Form1
        Inherits Form

        Public Sub New()
            InitializeComponent()
        End Sub

'#Region "#code"
        Private Sub Form1_Load(ByVal sender As Object, ByVal e As EventArgs)
            ' Create an empty chart.
            Dim stockChart As ChartControl = New ChartControl()
            ' Create a stock series, add it to the chart and set its properties.
            Dim series1 As Series = 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 TrendLine = 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.WholeRange.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
'#End Region  ' #code
    End Class
End Namespace