asp.net - How to create a chart legend title

Create the Chart legend title 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 the Chart legend title programmatically. Here we will use the Chart class Legends property to get the legend collection. Then we will get the specified legend instance by its id. And then we will create or change the Chart legend’s title by setting the Legend class Title property value.

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 Legend class represents the legend for the chart image. The Legend class encapsulates all the functionality of the Chart control's legend and is exposed using the Legends collection property of the root Chart object. In a Chart object can be any number of legends for a chart image.

The Legend class Title property gets or sets the text of the legend title. The Legend Title property value is a String that represents the legend title text. The default value of this property is a zero-length string.

So finally, the asp.net web developers can create a title for a Chart legend programmatically by setting the Legend class Title property value. They also can change a specified legend’s title text by changing its Title property value.
ChartLegendTitle.aspx

<%@ Page Language="C#" AutoEventWireup="true" %>

<!DOCTYPE html>

<script runat="server">
    protected void Button1_Click(object sender, System.EventArgs e)
    {
        Chart1.Legends["Legend1"].Title = "Nokia Phone Legend";
    }
</script>

<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
    <title>How to create Chart Legend Title programmatically in asp.net</title>
    <style type="text/css">
        h2
        {
            color:Crimson;
            font-style:italic;
            }
    </style>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <h2>Chart example and tutorial: How to create Chart Legend<br /> Title programmatically in asp.net</h2>
        <hr width="625" align="left" color="IndianRed" />
        <br />
        <asp:Chart 
            ID="Chart1" 
            runat="server"
            Width="625" 
            BackColor="Navy"
            BorderlineColor="SlateBlue"
            BorderlineDashStyle="Solid"
            BorderlineWidth="2"
            >
            <Legends>
                <asp:Legend 
                    Name="Legend1"
                    BackColor="AliceBlue"
                    ForeColor="CadetBlue"
                    BorderColor="LightBlue"
                    Docking="Right"
                    >
                </asp:Legend>
            </Legends>
            <Series>
                <asp:Series 
                    Name="NokiaPhone" 
                    YValueType="Double" 
                    ChartArea="DefaultChartArea"
                    ChartType="Pyramid"
                    Palette="Fire"
                    >
                    <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="DashDotDot"
                    BorderWidth="2"
                    BorderColor="DodgerBlue"
                    BackColor="MidnightBlue"
                    >
                    <Area3DStyle Enable3D="true" LightStyle="Realistic" />
                </asp:ChartArea>
            </ChartAreas>
        </asp:Chart>
        <br />
        <asp:Button 
            ID="Button1"
            runat="server"
            Text="Add Chart Legend Title"
            Font-Bold="true"
            OnClick="Button1_Click"
            ForeColor="DarkBlue"
            Height="45"
            />
    </div>
    </form>
</body>
</html>
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