How to use ImageMap in asp.net

asp.net ImageMap: how to use
ImageMap.aspx

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="ImageMap.aspx.cs" Inherits="ImageMap" %>

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title>asp.net ImageMap: how to use</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <h2 style="color:Red">ImageMap</h2>
        <asp:Label 
            ID="Label1"
            runat="server"
            Font-Size="Medium"
            ForeColor="DodgerBlue"
            >
        </asp:Label>
        <br />
        <asp:ImageMap 
            ID="ImageMap1"
            runat="server"
            ImageUrl="~/Images/Doll.gif"
            HotSpotMode="PostBack"
            OnClick="ImageMap1_Click"
            >
            <asp:RectangleHotSpot
                 Top="0" 
                 Bottom="360"
                 Left="0" 
                 Right="180" 
                 AlternateText="Green Doll" 
                 PostBackValue="Green Doll"
                 />
            <asp:RectangleHotSpot 
                Top="0"
                Bottom="360"
                Left="181"
                Right="360"
                AlternateText="Pink Doll"
                PostBackValue="Pink Doll"
                />
        </asp:ImageMap>
    </div>
    </form>
</body>
</html>
ImageMap.aspx.cs

using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;

public partial class ImageMap : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if(!Page.IsPostBack)
        {
            Label1.Text = "Click any doll!";
            ImageMap1.BorderWidth = 3;
            ImageMap1.BorderStyle = BorderStyle.Double;
            ImageMap1.BorderColor = System.Drawing.Color.Crimson;
        }
    }

    protected void ImageMap1_Click(object sender, ImageMapEventArgs e)
    {
        Label1.Text = "You ckecked: " + e.PostBackValue;
    }
}
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