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

private DataTable CreateChartData() {
    // Create an empty table.
    DataTable table = new DataTable("Table1");

    // Add three columns to the table.
    table.Columns.Add("Month", typeof(String));
    table.Columns.Add("Section", typeof(String));
    table.Columns.Add("Value", typeof(Int32));

    // Add data rows to the table.
    table.Rows.Add(new object[] { "Jan", "Section1", 10 });
    table.Rows.Add(new object[] { "Jan", "Section2", 20 });
    table.Rows.Add(new object[] { "Jan", "Section3", 40 });
    table.Rows.Add(new object[] { "Feb", "Section1", 20 });
    table.Rows.Add(new object[] { "Feb", "Section2", 30 });
    table.Rows.Add(new object[] { "Feb", "Section3", 80 });
    table.Rows.Add(new object[] { "March", "Section1", 30 });
    table.Rows.Add(new object[] { "March", "Section2", 40 });
    table.Rows.Add(new object[] { "March", "Section3", 100 });

    return table;
}

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

    // Generate a data table and bind the chart to it.
    chart.DataSource = CreateChartData();

    // Specify data members to bind the chart's series template.
    chart.SeriesDataMember = "Month";
    chart.SeriesTemplate.ArgumentDataMember = "Section";
    chart.SeriesTemplate.ValueDataMembers.AddRange(new string[] { "Value" });

    // Specify the template's series view.
    chart.SeriesTemplate.View = new SideBySideBarSeriesView();

    // Specify the BoundDataChanged event handler.
    chart.BoundDataChanged += 
        new BoundDataChangedEventHandler(chart_BoundDataChanged);

    // Specify the template's name prefix.
    chart.SeriesNameTemplate.BeginText = "Month: ";

    // Dock the chart into its parent, and add it to the current form.
    chart.Dock = DockStyle.Fill;
    this.Controls.Add(chart);
}

private void chart_BoundDataChanged(object sender, EventArgs e) {
    ChartControl chart = (ChartControl)sender;

    // Change the view of the "Month: Feb" series from 
    // SideBySideBarSeriesView to LineSeriesView.
    Series feb = chart.GetSeriesByName("Month: Feb");
    if(feb != null)
        feb.ChangeView(ViewType.Line);

    // Change the view of the "Month: March" series from 
    // SideBySideBarSeriesView to SplineSeriesView.
    Series march = chart.GetSeriesByName("Month: March");
    if(march != null)
        march.ChangeView(ViewType.Spline);
}

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

Private Function CreateChartData() As DataTable
    ' Create an empty table.
    Dim table As New DataTable("Table1")

    ' Add three columns to the table.
    table.Columns.Add("Month", GetType(String))
    table.Columns.Add("Section", GetType(String))
    table.Columns.Add("Value", GetType(Int32))

    ' Add data rows to the table.
    table.Rows.Add(New Object() { "Jan", "Section1", 10 })
    table.Rows.Add(New Object() { "Jan", "Section2", 20 })
    table.Rows.Add(New Object() { "Jan", "Section3", 40 })
    table.Rows.Add(New Object() { "Feb", "Section1", 20 })
    table.Rows.Add(New Object() { "Feb", "Section2", 30 })
    table.Rows.Add(New Object() { "Feb", "Section3", 80 })
    table.Rows.Add(New Object() { "March", "Section1", 30 })
    table.Rows.Add(New Object() { "March", "Section2", 40 })
    table.Rows.Add(New Object() { "March", "Section3", 100 })

    Return table
End Function

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

    ' Generate a data table and bind the chart to it.
    chart.DataSource = CreateChartData()

    ' Specify data members to bind the chart's series template.
    chart.SeriesDataMember = "Month"
    chart.SeriesTemplate.ArgumentDataMember = "Section"
    chart.SeriesTemplate.ValueDataMembers.AddRange(New String() { "Value" })

    ' Specify the template's series view.
    chart.SeriesTemplate.View = New SideBySideBarSeriesView()

    ' Specify the BoundDataChanged event handler.
    AddHandler chart.BoundDataChanged, AddressOf chart_BoundDataChanged

    ' Specify the template's name prefix.
    chart.SeriesNameTemplate.BeginText = "Month: "

    ' Dock the chart into its parent, and add it to the current form.
    chart.Dock = DockStyle.Fill
    Me.Controls.Add(chart)
End Sub

Private Sub chart_BoundDataChanged(ByVal sender As Object, ByVal e As EventArgs)
    Dim chart As ChartControl = CType(sender, ChartControl)

    ' Change the view of the "Month: Feb" series from 
    ' SideBySideBarSeriesView to LineSeriesView.
    Dim feb As Series = chart.GetSeriesByName("Month: Feb")
    If feb IsNot Nothing Then
    feb.ChangeView(ViewType.Line)
    End If

    ' Change the view of the "Month: March" series from 
    ' SideBySideBarSeriesView to SplineSeriesView.
    Dim march As Series = chart.GetSeriesByName("Month: March")
    If march IsNot Nothing Then
    march.ChangeView(ViewType.Spline)
    End If
End Sub