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You can add an ImageMap control to a form in much the same way as an Image control. Just drop it onto the page, and set the ImageUrl property to the name of the image file you want to use. You can also use the usual ImageAlign, BorderStyle, BorderWidth, and BorderColor properties. To define the clickable regions, you need to add HotSpot objects to the ImageMap.HotSpots property. You can use three derived classes: CircleHotSpot, RectangleHotSpot, and PolygonHotSpot. These choices aren t arbitrary they match the three shape types defined in the HTML standard. Before you can tackle this task, you need to know the exact coordinates of the hotspot you want to create. Unfortunately, the ImageMap designer isn t much help, so you ll probably rely on a dedicated HTML authoring program. For example, Figure 30-1 shows three circle hotspots being adjusted with Microsoft FrontPage.

Now that you know the steps for creating web part pages with ASP.NET 2.0, it s time to take a closer look at web part development. As you know, a web part can be any type of ASP .NET control, including user controls, built-in or custom server controls, and ASP .NET controls directly inherited from the WebPart base class of the new namespace System.Web.UI.WebControls.WebParts. You have seen that every web part on your page automatically gets a default caption and default menus for minimizing and restoring the web part. Now it s time to learn how you can customize this text and add menu entries (called verbs) to your custom web part. Any web part can provide custom public properties that the user can modify through an editor web part, which can be added to a web part called EditorZone. This EditorZone is displayed when the web part page is switched to the Edit mode, as introduced in Table 30-1. To do this, you have to create a separate editor part for your web part and somehow connect them. The next section shows how to do this. Finally, web parts can communicate with other web parts through a well-defined mechanism. Therefore, these web parts exchange data and display information based on events that happen in other web parts. You will learn how to connect web parts in the Connecting Web Parts section.

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The simple way to connect WebParts is through static connections. How can you do that Well, let s think about the roles of the different controls involved in WebPart pages again. The WebPartManager knows about all the WebParts and manages features such as personalization. WebPartZones are areas on your web page that can contain WebParts, while the WebParts are independent controls. If you think about it one moment, you definitely will recognize that the WebPartManager might be a good starting point for taking a closer look at connection points. You are right: Static connection points are configured through the WebPartManager as follows: <asp:WebPartManager runat="server" ID="MyPartManager"> <StaticConnections> <asp:WebPartConnection ID="SimpleConnection" ProviderID="MyCustomerNotes" ConsumerID="MyNotesConsumer" /> </StaticConnections> </asp:WebPartManager> The ID values used for the ProviderID and ConsumerID are just the ID values of the WebParts as they have been added to the WebPartZone. You can find these WebParts in the zones of your WebPart page, as you can see in the following code fragment: <table width="100%"> ... <asp:WebPartZone runat="server" ID="MainZone" > <ZoneTemplate> <uc1:Customers ID="MyCustomers" runat="server" OnLoad="MyCustomers_Load" /> <apress:CustomerNotesPart ID="MyCustomerNotes" runat="server" /> </ZoneTemplate> </asp:WebPartZone> ... <asp:WebPartZone runat="server" ID="HelpZone> <ZoneTemplate> <apress:CustomerNotesConsumer ID="MyNotesConsumer" runat="server" /> <asp:Calendar runat="server" ID="MyCalendar" OnLoad="MyCalendar_Load" /> <asp:FileUpload ID="MyUpload" runat="server" /> </ZoneTemplate> </asp:WebPartZone> ... </table>

It s acceptable to have overlapping hotspots, but the hotspot that is defined first will handle the click. In the example shown in Figure 30-1, this means it makes sense to define the hotspots in this order: DVDs, Media, CDs.

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