Series Colorizer

• Jun 18, 2021
• 11 minutes to read

The Series Colorizer uses predefined algorithms to assign colors to bound series.

The image above shows a chart with the SeriesKeyColorColorizer applied (the Flow palette).

Add Colorizer at Design-Time

Run the Chart Designer from the WebChartControl Tasks list.

Choose the Properties tab and expand the Series Template item. Select a colorizer from the drop-down list next to the SeriesColorizer property.

For information on colorizer settings, refer to the following section: Predefined Series Colorizers.

Add Colorizer in Code

Use the following code to add a colorizer in markup.

ASPX

<dx:WebChartControl ID="WebChartControl1" runat="server">
    <SeriesTemplate>
        <SeriesColorizerSerializable>
            <dx:SeriesKeyColorColorizer>
                <KeysSerializable>
                    <dx:ObjectSerializable Type="System.String" Value="Europe" />
                    <dx:ObjectSerializable Type="System.String" Value="Americas" />
                    <dx:ObjectSerializable Type="System.String" Value="Africa" />
                </KeysSerializable>
            </dx:SeriesKeyColorColorizer>
        </SeriesColorizerSerializable>
    </SeriesTemplate>
</dx:WebChartControl>

To add a colorizer at runtime, assign a colorizer object to the SeriesTemplate.SeriesColorizer property.

C#

WebChartControl1.SeriesDataMember = "Continent";
WebChartControl1.SeriesTemplate.ArgumentDataMember = "Year";
WebChartControl1.SeriesTemplate.ValueDataMembers.AddRange(new string[] { "Population" });
WebChartControl1.SeriesTemplate.View = new LineSeriesView();
SeriesKeyColorColorizer colorizer = new SeriesKeyColorColorizer() {
    PaletteName = "Flow",
};
colorizer.Keys.AddRange(new object[] { "Europe", "Americas", "Africa" });
WebChartControl1.SeriesTemplate.SeriesColorizer = colorizer;

VB.NET

WebChartControl1.SeriesDataMember = "Continent"
WebChartControl1.SeriesTemplate.ArgumentDataMember = "Year"
WebChartControl1.SeriesTemplate.ValueDataMembers.AddRange(New String() {"Population"})
WebChartControl1.SeriesTemplate.View = New LineSeriesView()
Dim colorizer As SeriesKeyColorColorizer = New SeriesKeyColorColorizer() With {
    .PaletteName = "Flow"
}
colorizer.Keys.AddRange(New Object() {"Europe", "Americas", "Africa"})
WebChartControl1.SeriesTemplate.SeriesColorizer = colorizer

Predefined Series Colorizers

You can use one of the following predefined colorizers:

• SeriesKeyColorColorizer
• SeriesDataSourceColorizer

SeriesKeyColorColorizer

The SeriesKeyColorColorizer applies a different color (from a standard or a custom palette) to each series. To apply the colorizer to series, follow the steps below:

• Add SeriesDataMember field values to the SeriesKeyColorColorizer.Keys collection.

• Use the SeriesKeyColorColorizer.PaletteName property to specify the palette name. The following help topic lists all available standard palettes: Palettes.

The following code applies the same color from the In A Fog palette to series with equal associated keys: “Europe”, “Americas”, or “Africa”.

ASPX

<dx:WebChartControl ID="WebChartControl1" runat="server">
    <Legend Name="Default Legend"></Legend>
    <Titles>
        <dx:ChartTitle Text="Historic, current and future population "></dx:ChartTitle>
    </Titles>
</dx:WebChartControl>

C#

using DevExpress.XtraCharts;
using System;
using System.Data;

public partial class _Default : System.Web.UI.Page {
    protected void Page_Init(object sender, EventArgs e) {
        WebChartControl1.DataSource = GetData();
        WebChartControl1.DataBind();
        WebChartControl1.SeriesDataMember = "Continent";
        WebChartControl1.SeriesTemplate.ArgumentDataMember = "Year";
        WebChartControl1.SeriesTemplate.ValueDataMembers.AddRange(new string[] { "Population" });
        WebChartControl1.SeriesTemplate.View = new LineSeriesView();
        SeriesKeyColorColorizer colorizer = new SeriesKeyColorColorizer() {
            PaletteName = "In A Fog",
        };
        colorizer.Keys.AddRange(new object[] { "Europe", "Americas", "Africa" });
        WebChartControl1.SeriesTemplate.SeriesColorizer = colorizer;
    }
    internal static DataTable GetData() {
        DataTable table = new DataTable();
        table.Columns.AddRange(new DataColumn[] { new DataColumn("Continent", typeof(string)), 
                                                  new DataColumn("Year", typeof(int)), 
                                                  new DataColumn("Population", typeof(Int32)) });
        table.Rows.Add("Europe", 1980, 694);
        table.Rows.Add("Europe", 1990, 721);
        table.Rows.Add("Europe", 2000, 730);
        table.Rows.Add("Europe", 2010, 728);
        table.Rows.Add("Europe", 2020, 721);
        table.Rows.Add("Europe", 2030, 704);

        table.Rows.Add("Americas", 1980, 641);
        table.Rows.Add("Americas", 1990, 721);
        table.Rows.Add("Americas", 2000, 836);
        table.Rows.Add("Americas", 2010, 935);
        table.Rows.Add("Americas", 2020, 1027);
        table.Rows.Add("Americas", 2030, 1110);

        table.Rows.Add("Africa", 1980, 471);
        table.Rows.Add("Africa", 1990, 623);
        table.Rows.Add("Africa", 2000, 797);
        table.Rows.Add("Africa", 2010, 982);
        table.Rows.Add("Africa", 2020, 1189);
        table.Rows.Add("Africa", 2030, 1416);
        return table;
    }
}

VB.NET

Imports DevExpress.XtraCharts
Imports System
Imports System.Data

Public Partial Class _Default
    Inherits System.Web.UI.Page

    Protected Sub Page_Init(ByVal sender As Object, ByVal e As EventArgs)
        WebChartControl1.DataSource = GetData()
        WebChartControl1.DataBind()
        WebChartControl1.SeriesDataMember = "Continent"
        WebChartControl1.SeriesTemplate.ArgumentDataMember = "Year"
        WebChartControl1.SeriesTemplate.ValueDataMembers.AddRange(New String() {"Population"})
        WebChartControl1.SeriesTemplate.View = New LineSeriesView()
        Dim colorizer As SeriesKeyColorColorizer = New SeriesKeyColorColorizer() With {
            .PaletteName = "In A Fog"
        }
        colorizer.Keys.AddRange(New Object() {"Europe", "Americas", "Africa"})
        WebChartControl1.SeriesTemplate.SeriesColorizer = colorizer
    End Sub

    Friend Shared Function GetData() As DataTable
        Dim table As DataTable = New DataTable()
        table.Columns.AddRange(New DataColumn() {New DataColumn("Continent", GetType(String)), 
                                                 New DataColumn("Year", GetType(Integer)), 
                                                 New DataColumn("Population", GetType(Int32))})
        table.Rows.Add("Europe", 1980, 694)
        table.Rows.Add("Europe", 1990, 721)
        table.Rows.Add("Europe", 2000, 730)
        table.Rows.Add("Europe", 2010, 728)
        table.Rows.Add("Europe", 2020, 721)
        table.Rows.Add("Europe", 2030, 704)

        table.Rows.Add("Americas", 1980, 641)
        table.Rows.Add("Americas", 1990, 721)
        table.Rows.Add("Americas", 2000, 836)
        table.Rows.Add("Americas", 2010, 935)
        table.Rows.Add("Americas", 2020, 1027)
        table.Rows.Add("Americas", 2030, 1110)

        table.Rows.Add("Africa", 1980, 471)
        table.Rows.Add("Africa", 1990, 623)
        table.Rows.Add("Africa", 2000, 797)
        table.Rows.Add("Africa", 2010, 982)
        table.Rows.Add("Africa", 2020, 1189)
        table.Rows.Add("Africa", 2030, 1416)
        Return table
    End Function
End Class

Result:

Note

When the SeriesKeyColorColorizer.Keys collection is empty, the colorizer fills this collection with unique SeriesDataMember values.

You can use custom logic to assign color keys to series. Create a custom key provider that inherits the IColorizerKeyProvider interface and implement the GetKey(Object) method for this purpose. Assign an instance of this provider to the SeriesKeyColorColorizer.KeyProvider property as follows:

ASPX

<dx:WebChartControl ID="WebChartControl1" runat="server">
    <Legend Name="Default Legend"></Legend>
</dx:WebChartControl>

C#

using DevExpress.XtraCharts;
using System;
using System.Collections.Generic;
using System.Data;
using System.Drawing;

public partial class _Default : System.Web.UI.Page {
   protected void Page_Init(object sender, EventArgs e) {
       WebChartControl1.DataSource = GetData();
       WebChartControl1.DataBind();
       WebChartControl1.SeriesDataMember = "Region";
       WebChartControl1.SeriesTemplate.ArgumentDataMember = "Year";
       WebChartControl1.SeriesTemplate.View = new LineSeriesView();
       WebChartControl1.SeriesTemplate.ValueDataMembers.AddRange(new string[] { "Sales" });
       WebChartControl1.SeriesTemplate.ArgumentScaleType = ScaleType.Qualitative;
       WebChartControl1.SeriesTemplate.ValueScaleType = ScaleType.Numerical;
       SeriesKeyColorColorizer colorizer = new SeriesKeyColorColorizer() {
           PaletteName = "Slipstream",
           // Assign a provider instance to the KeyProvider property.
           KeyProvider = new CustomKeyProvider(),
       };
       colorizer.Keys.AddRange(new object[] { "key1", "key2", "key3" });
       WebChartControl1.SeriesTemplate.SeriesColorizer = colorizer;
   }
   internal static DataTable GetData() {
       DataTable table = new DataTable();
       table.Columns.AddRange(new DataColumn[] { new DataColumn("Region", typeof(string)), 
                                                 new DataColumn("Year", typeof(int)), 
                                                 new DataColumn("Sales", typeof(decimal)) });
       table.Rows.Add("Asia", 2017, 4.2372D);
       table.Rows.Add("Asia", 2018, 4.7685D);
       table.Rows.Add("Asia", 2019, 5.2890D);
       table.Rows.Add("Australia", 2017, 1.7871D);
       table.Rows.Add("Australia", 2018, 1.9576D);
       table.Rows.Add("Australia", 2019, 2.2727D);
       table.Rows.Add("Europe", 2017, 3.0884D);
       table.Rows.Add("Europe", 2018, 3.3579D);
       table.Rows.Add("Europe", 2019, 3.7257D);
       table.Rows.Add("North America", 2017, 3.4855D);
       table.Rows.Add("North America", 2018, 3.7477D);
       table.Rows.Add("North America", 2019, 4.1825D);
       table.Rows.Add("South America", 2017, 1.6027D);
       table.Rows.Add("South America", 2018, 1.8237D);
       table.Rows.Add("South America", 2019, 2.1172D);

       return table;
   }
}
//Implement a custom key provider class. 
internal class CustomKeyProvider : IColorizerKeyProvider {
   public object GetKey(object colorKey) {
       string seriesName = colorKey.ToString();
       if (seriesName.StartsWith("A"))
           return "key1";
       if (seriesName.Contains("America")) {
           return "key2";
       }
       else
           return "key3";
   }
}

VB.NET

Imports DevExpress.XtraCharts
Imports System
Imports System.Collections.Generic
Imports System.Data
Imports System.Drawing

Public Partial Class _Default
   Inherits System.Web.UI.Page

   Protected Sub Page_Init(ByVal sender As Object, ByVal e As EventArgs)
       WebChartControl1.DataSource = GetData()
       WebChartControl1.DataBind()
       WebChartControl1.SeriesDataMember = "Region"
       WebChartControl1.SeriesTemplate.ArgumentDataMember = "Year"
       WebChartControl1.SeriesTemplate.View = New LineSeriesView()
       WebChartControl1.SeriesTemplate.ValueDataMembers.AddRange(New String() {"Sales"})
       WebChartControl1.SeriesTemplate.ArgumentScaleType = ScaleType.Qualitative
       WebChartControl1.SeriesTemplate.ValueScaleType = ScaleType.Numerical
       Dim colorizer As SeriesKeyColorColorizer = New SeriesKeyColorColorizer() With {
           .PaletteName = "Slipstream",
            'Assign a provider instance to the KeyProvider property.
           .KeyProvider = New CustomKeyProvider()
       }
       colorizer.Keys.AddRange(New Object() {"key1", "key2", "key3"})
       WebChartControl1.SeriesTemplate.SeriesColorizer = colorizer
   End Sub

   Friend Shared Function GetData() As DataTable
       Dim table As DataTable = New DataTable()
       table.Columns.AddRange(New DataColumn() {New DataColumn("Region", GetType(String)), 
                                                New DataColumn("Year", GetType(Integer)), 
                                                New DataColumn("Sales", GetType(Decimal))})
       table.Rows.Add("Asia", 2017, 4.2372R)
       table.Rows.Add("Asia", 2018, 4.7685R)
       table.Rows.Add("Asia", 2019, 5.2890R)
       table.Rows.Add("Australia", 2017, 1.7871R)
       table.Rows.Add("Australia", 2018, 1.9576R)
       table.Rows.Add("Australia", 2019, 2.2727R)
       table.Rows.Add("Europe", 2017, 3.0884R)
       table.Rows.Add("Europe", 2018, 3.3579R)
       table.Rows.Add("Europe", 2019, 3.7257R)
       table.Rows.Add("North America", 2017, 3.4855R)
       table.Rows.Add("North America", 2018, 3.7477R)
       table.Rows.Add("North America", 2019, 4.1825R)
       table.Rows.Add("South America", 2017, 1.6027R)
       table.Rows.Add("South America", 2018, 1.8237R)
       table.Rows.Add("South America", 2019, 2.1172R)
       Return table
   End Function
End Class

'Implement a custom key provider class. 
Friend Class CustomKeyProvider
   Inherits IColorizerKeyProvider

   Public Function GetKey(ByVal colorKey As Object) As Object
       Dim seriesName As String = colorKey.ToString()
       If seriesName.StartsWith("A") Then Return "key1"
       If seriesName.Contains("America") Then
           Return "key2"
       Else
           Return "key3"
       End If
   End Function
End Class

Result:

SeriesDataSourceColorizer

SeriesDataSourceColorizer gets colors from a data source and uses them to paint series. The data source should contain values with one of the following types:

• an integer ARGB color value;
• a string color name;
• a Color object.

The example below customizes the colorizer.

ASPX

<dx:WebChartControl ID="WebChartControl1" runat="server">
    <Legend Name="Default Legend"></Legend>
    <Titles>
        <dx:ChartTitle Text="Historic, current and future population "></dx:ChartTitle>
    </Titles>
</dx:WebChartControl>

C#

using DevExpress.XtraCharts;
using System;
using System.Collections.Generic;
using System.Data;
using System.Drawing;

public partial class _Default : System.Web.UI.Page {
    protected void Page_Init(object sender, EventArgs e) {
        WebChartControl1.DataSource = GetData(); 
        WebChartControl1.DataBind();
        WebChartControl1.SeriesDataMember = "Continent";
        WebChartControl1.SeriesTemplate.ArgumentDataMember = "Year";
        WebChartControl1.SeriesTemplate.View = new LineSeriesView();
        WebChartControl1.SeriesTemplate.ValueDataMembers.AddRange(new string[] { "Population" });

        WebChartControl1.SeriesTemplate.SeriesColorizer = new SeriesDataSourceColorizer() {
            DataSource = new List<Continent> {
                new Continent { Name = "Europe", Marker = Color.FromArgb(0xE1, 0x83, 0x35) },
                new Continent { Name = "Americas", Marker = Color.FromArgb(0x1E, 0x91, 0xD6) },
                new Continent { Name = "Africa", Marker = Color.FromArgb(0x8F, 0xC9, 0x3A) }
            },
            SeriesKeyMember = "Name",
            SeriesColorMember = "Marker"
        };
    }
    internal static DataTable GetData() {
        DataTable table = new DataTable();
        table.Columns.AddRange(new DataColumn[] { new DataColumn("Continent", typeof(string)), 
                                                  new DataColumn("Year", typeof(int)), 
                                                  new DataColumn("Population", typeof(Int32)) });
        table.Rows.Add("Europe", 1980, 694);
        table.Rows.Add("Europe", 1990, 721);
        table.Rows.Add("Europe", 2000, 730);
        table.Rows.Add("Europe", 2010, 728);
        table.Rows.Add("Europe", 2020, 721);
        table.Rows.Add("Europe", 2030, 704);

        table.Rows.Add("Americas", 1980, 641);
        table.Rows.Add("Americas", 1990, 721);
        table.Rows.Add("Americas", 2000, 836);
        table.Rows.Add("Americas", 2010, 935);
        table.Rows.Add("Americas", 2020, 1027);
        table.Rows.Add("Americas", 2030, 1110);

        table.Rows.Add("Africa", 1980, 471);
        table.Rows.Add("Africa", 1990, 623);
        table.Rows.Add("Africa", 2000, 797);
        table.Rows.Add("Africa", 2010, 982);
        table.Rows.Add("Africa", 2020, 1189);
        table.Rows.Add("Africa", 2030, 1416);
        return table;
    }
}

class Continent {
    public String Name { get; set; }
    public Color Marker { get; set; }
}

VB.NET

Imports DevExpress.XtraCharts
Imports System
Imports System.Collections.Generic
Imports System.Data
Imports System.Drawing

Public Partial Class _Default
    Inherits System.Web.UI.Page

    Protected Sub Page_Init(ByVal sender As Object, ByVal e As EventArgs)
        WebChartControl1.DataSource = GetData() 
        WebChartControl1.DataBind()
        WebChartControl1.SeriesDataMember = "Continent"
        WebChartControl1.SeriesTemplate.ArgumentDataMember = "Year"
        WebChartControl1.SeriesTemplate.View = New LineSeriesView()
        WebChartControl1.SeriesTemplate.ValueDataMembers.AddRange(New String() {"Population"})
        WebChartControl1.SeriesTemplate.SeriesColorizer = New SeriesDataSourceColorizer() With {
            .DataSource = New List(Of Continent) From {
                New Continent With {
                    .Name = "Europe",
                    .Marker = Color.FromArgb(&HE1, &H83, &H35)
                },
                New Continent With {
                    .Name = "Americas",
                    .Marker = Color.FromArgb(&H1E, &H91, &HD6)
                },
                New Continent With {
                    .Name = "Africa",
                    .Marker = Color.FromArgb(&H8F, &HC9, &H3A)
                }
            },
            .SeriesKeyMember = "Name",
            .SeriesColorMember = "Marker"
        }
    End Sub
    Friend Shared Function GetData() As DataTable
        Dim table As DataTable = New DataTable()
        table.Columns.AddRange(New DataColumn() {New DataColumn("Continent", GetType(String)), 
                                                 New DataColumn("Year", GetType(Integer)), 
                                                 New DataColumn("Population", GetType(Int32))})
        table.Rows.Add("Europe", 1980, 694)
        table.Rows.Add("Europe", 1990, 721)
        table.Rows.Add("Europe", 2000, 730)
        table.Rows.Add("Europe", 2010, 728)
        table.Rows.Add("Europe", 2020, 721)
        table.Rows.Add("Europe", 2030, 704)

        table.Rows.Add("Americas", 1980, 641)
        table.Rows.Add("Americas", 1990, 721)
        table.Rows.Add("Americas", 2000, 836)
        table.Rows.Add("Americas", 2010, 935)
        table.Rows.Add("Americas", 2020, 1027)
        table.Rows.Add("Americas", 2030, 1110)

        table.Rows.Add("Africa", 1980, 471)
        table.Rows.Add("Africa", 1990, 623)
        table.Rows.Add("Africa", 2000, 797)
        table.Rows.Add("Africa", 2010, 982)
        table.Rows.Add("Africa", 2020, 1189)
        table.Rows.Add("Africa", 2030, 1416)
        Return table
    End Function
End Class
End Class

Class Continent
    Public Property Name As String
    Public Property Marker As Color
End Class

The example uses the following API members:

Property	Description
SeriesDataSourceColorizer.DataSource	The data source with color items.
SeriesDataSourceColorizer.SeriesKeyMember	The name of the data source field that contains colors.
SeriesDataSourceColorizer.SeriesColorMember	The name of the data source field that contains series identifiers.

Result:

Custom Series Colorizer

To create a custom series colorizer, the colorizer should inherit the abstract SeriesColorizerBase class. Override the SeriesColorizerBase.GetSeriesColor method and implement your custom logic to return a color that corresponds to the series key (the series data member value).

The following example uses the Colors dictionary to store series colors that are specified in code. If a series color is not set, the colorizer gets the color from the default palette.

ASPX

<dx:WebChartControl ID="WebChartControl1" runat="server">
    <Legend Name="Default Legend"></Legend>
    <Titles>
        <dx:ChartTitle Text="Historic, current and future population "></dx:ChartTitle>
    </Titles>
</dx:WebChartControl>

C#

using DevExpress.XtraCharts;
using System;
using System.Collections.Generic;
using System.Data;
using System.Drawing;

public partial class _Default : System.Web.UI.Page {
    protected void Page_Init(object sender, EventArgs e) {
        WebChartControl1.DataSource = GetData();
        WebChartControl1.DataBind();
        WebChartControl1.SeriesDataMember = "Continent";
        WebChartControl1.SeriesTemplate.ArgumentDataMember = "Year";
        WebChartControl1.SeriesTemplate.ValueDataMembers.AddRange(new string[] { "Population" });
        WebChartControl1.SeriesTemplate.View = new LineSeriesView();

        CustomSeriesColorizer customSeriesColorizer = new CustomSeriesColorizer();
        customSeriesColorizer.Colors["Europe"] = Color.Red;
        customSeriesColorizer.Colors["Americas"] = Color.Green;
        WebChartControl1.SeriesTemplate.SeriesColorizer = customSeriesColorizer;
    }
    internal static DataTable GetData() {
        DataTable table = new DataTable();
        table.Columns.AddRange(new DataColumn[] { new DataColumn("Continent", typeof(string)),
                                                  new DataColumn("Year", typeof(int)),
                                                  new DataColumn("Population", typeof(Int32)) });
        table.Rows.Add("Europe", 1990, 721);
        table.Rows.Add("Europe", 2000, 730);
        table.Rows.Add("Europe", 2010, 728);
        table.Rows.Add("Europe", 2020, 721);
        table.Rows.Add("Europe", 2030, 704);

        table.Rows.Add("Americas", 1990, 721);
        table.Rows.Add("Americas", 2000, 836);
        table.Rows.Add("Americas", 2010, 935);
        table.Rows.Add("Americas", 2020, 1027);
        table.Rows.Add("Americas", 2030, 1110);

        table.Rows.Add("Africa", 1990, 623);
        table.Rows.Add("Africa", 2000, 797);
        table.Rows.Add("Africa", 2010, 982);
        table.Rows.Add("Africa", 2020, 1189);
        table.Rows.Add("Africa", 2030, 1416);

        return table;
    }
    class CustomSeriesColorizer : SeriesColorizerBase {
        List<object> metColors = new List<object>();
        public readonly Dictionary<string, Color> Colors = new Dictionary<string, Color>();
        public override Color GetSeriesColor(object seriesKey, Palette palette) {
            Color color;
            if (Colors.TryGetValue(seriesKey.ToString(), out color)) {
                return color;
            }
            else {
                int keyIndex;
                if (metColors.Contains(seriesKey)) {
                    keyIndex = metColors.IndexOf(seriesKey);
                }
                else {
                    keyIndex = metColors.Count;
                    metColors.Add(seriesKey);
                }
                return palette[keyIndex % palette.Count].Color;
            }
        }
        protected override ChartElement CreateObjectForClone() {
            return new CustomSeriesColorizer();
        }
    }
}

VB.NET

Imports DevExpress.XtraCharts
Imports System
Imports System.Collections.Generic
Imports System.Data
Imports System.Drawing

Public Partial Class _Default
    Inherits System.Web.UI.Page

    Protected Sub Page_Init(ByVal sender As Object, ByVal e As EventArgs)
        WebChartControl1.DataSource = GetData()
        WebChartControl1.DataBind()
        WebChartControl1.SeriesDataMember = "Continent"
        WebChartControl1.SeriesTemplate.ArgumentDataMember = "Year"
        WebChartControl1.SeriesTemplate.ValueDataMembers.AddRange(New String() {"Population"})
        WebChartControl1.SeriesTemplate.View = New LineSeriesView()
        Dim customSeriesColorizer As CustomSeriesColorizer = New CustomSeriesColorizer()
        customSeriesColorizer.Colors("Europe") = Color.Red
        customSeriesColorizer.Colors("Americas") = Color.Green
        WebChartControl1.SeriesTemplate.SeriesColorizer = customSeriesColorizer
    End Sub

    Friend Shared Function GetData() As DataTable
        Dim table As DataTable = New DataTable()
        table.Columns.AddRange(New DataColumn() {New DataColumn("Continent", GetType(String)), New DataColumn("Year", GetType(Integer)), New DataColumn("Population", GetType(Int32))})
        table.Rows.Add("Europe", 1990, 721)
        table.Rows.Add("Europe", 2000, 730)
        table.Rows.Add("Europe", 2010, 728)
        table.Rows.Add("Europe", 2020, 721)
        table.Rows.Add("Europe", 2030, 704)
        table.Rows.Add("Americas", 1990, 721)
        table.Rows.Add("Americas", 2000, 836)
        table.Rows.Add("Americas", 2010, 935)
        table.Rows.Add("Americas", 2020, 1027)
        table.Rows.Add("Americas", 2030, 1110)
        table.Rows.Add("Africa", 1990, 623)
        table.Rows.Add("Africa", 2000, 797)
        table.Rows.Add("Africa", 2010, 982)
        table.Rows.Add("Africa", 2020, 1189)
        table.Rows.Add("Africa", 2030, 1416)
        Return table
    End Function

    Class CustomSeriesColorizer
        Inherits SeriesColorizerBase

        Private metColors As List(Of Object) = New List(Of Object)()
        Public ReadOnly Colors As Dictionary(Of String, Color) = New Dictionary(Of String, Color)()

        Public Overrides Function GetSeriesColor(ByVal seriesKey As Object, ByVal palette As Palette) As Color
            Dim color As Color

            If Colors.TryGetValue(seriesKey.ToString(), color) Then
                Return color
            Else
                Dim keyIndex As Integer

                If metColors.Contains(seriesKey) Then
                    keyIndex = metColors.IndexOf(seriesKey)
                Else
                    keyIndex = metColors.Count
                    metColors.Add(seriesKey)
                End If

                Return palette(keyIndex Mod palette.Count).Color
            End If
        End Function

        Protected Overrides Function CreateObjectForClone() As ChartElement
            Return New CustomSeriesColorizer()
        End Function
    End Class
End Class

Result: