asp.net - How to create a chart legend programmatically

Add a chart legend programmatically
The Chart class serves as the root class of the Chart control. The Chart class exposes all of the properties, methods, and events of the Chart Web server control. The Chart Series collection property stores Series objects which are used to store data that is to be displayed, along with attributes of that data. The Chart ChartAreas collection property stores ChartArea objects, which are primarily used to draw one or more charts using one set of axes.

The following asp.net c# web development tutorial code demonstrates how we can create a Chart legend programmatically. Here we will use the Chart class Legends property to get the legend collection. Then we will call the LegendCollection class Add() method to create and add a new legend to the legend collection.

The Chart Legends property gets or sets a LegendCollection object that is used to store all Legend objects used by the Chart control. This property value is a LegendCollection that is used to store all Legend objects. This Chart collection property stores all Legend objects used by the Chart control.

The LegendCollection class represents a collection of Legend objects. The LegendCollection class is implemented as the Legends collection property of the root Chart object. The asp.net web developers can append, insert or remove Legend objects from the collection at either design time or run time.

The LegendCollection class Add(String) method adds the specified Legend object to the end of the collection. The Add(string name) method has a parameter named name. The name parameter is a String which is the name of the legend to be added. The LegendCollection class Add() method returns a Legend.
CreateChartLegend.aspx

<%@ Page Language="C#" AutoEventWireup="true" %>
<%@Import Namespace="System.Web.UI.DataVisualization.Charting" %>

<!DOCTYPE html>

<script runat="server">
    protected void Button1_Click(object sender, System.EventArgs e)
    {
        Chart1.Legends.Add("ChartLegend");
    }
</script>

<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
    <title>How to create Chart Legend programmatically in asp.net</title>
    <style type="text/css">
        h2
        {
            color:DarkBlue;
            font-style:italic;
            }
    </style>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <h2>Chart example and tutorial: How to create<br /> Chart Legend programmatically in asp.net</h2>
        <hr width="625" align="left" color="LightBlue" />
        <br />
        <asp:Chart 
            ID="Chart1" 
            runat="server"
            Width="625" 
            BackColor="BurlyWood"
            BorderlineColor="SandyBrown"
            BorderlineDashStyle="Solid"
            BorderlineWidth="2"
            >
            <Series>
                <asp:Series 
                    Name="NokiaPhone" 
                    YValueType="Double" 
                    ChartArea="DefaultChartArea"
                    ChartType="Pie"
                    Palette="Chocolate"
                    >
                    <Points>
                        <asp:DataPoint AxisLabel="Nokia N8" YValues="549" />
                        <asp:DataPoint AxisLabel="Nokia N97 mini" YValues="379.99" />
                        <asp:DataPoint AxisLabel="X6 16GB Driver Edition" YValues="329" />
                        <asp:DataPoint AxisLabel="Nokia C6" YValues="309" />
                    </Points>
                </asp:Series>
            </Series>
            <ChartAreas>
                <asp:ChartArea 
                    Name="DefaultChartArea" 
                    BorderDashStyle="Dot"
                    BorderWidth="2"
                    BorderColor="Green"
                    BackColor="DarkGreen"
                    >
                    <Area3DStyle Enable3D="true" LightStyle="Realistic" />
                </asp:ChartArea>
            </ChartAreas>
        </asp:Chart>
        <br />
        <asp:Button 
            ID="Button1"
            runat="server"
            Text="Create Chart Legend"
            Font-Bold="true"
            OnClick="Button1_Click"
            ForeColor="DarkBlue"
            Height="45"
            />
    </div>
    </form>
</body>
</html>
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