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Specifying sections of an image that are clickable (C#)

<%@ page language="C#" %> <script runat="server">     protected void Imagemap1_Click(object sender,        System.Web.UI.WebControls.ImageMapEventArgs e) {                      Response.Write("You selected: " + e.PostBackValue);     } </script> <html xmlns="http://www.w3.org/1999/xhtml" > <head id="Head1" runat="server">     <title>ImageMap Control</title> </head> <body>     <form id="form1" runat="server">         <asp:ImageMap ID="Imagemap1"                        Runat="server"                        ImageUrl="http://www.rntsoft.com/style/logo.png"                        Width=300                        OnClick="Imagemap1_Click"                        HotSpotMode="PostBack">             <asp:RectangleHotSpot Top="0"                                    Bottom="225"                                    Left="0" Right="150"                                    AlternateText="Henri"                                    PostBackValue="Henri">             </asp:RectangleHotSpot>             <asp:RectangleHotSpot Top="0" Bottom="225" Left="151" Right="300"               AlternateText="Sofia" PostBackValue="Sofia">             </asp:RectangleHotSpot>         </asp:ImageMap>     </form> </body> </html>