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You have already seen that the simplest way to create custom web parts is to create user controls. The only difference is that you add these controls to the ZoneTemplate section of a WebPartZone instead of directly to the page. Basically, the ASP.NET 2.0 Web Parts Framework wraps your user control into an instance of GenericWebPart. This GenericWebPart class makes sure your user control gets the frame and the verbs menu for minimizing and restoring the web part. The same is true for any other server control (either built-in or custom): as long as an ASP .NET control is not inherited from System.Web.UI.WebControls.WebParts.WebPart, the Web Parts Framework wraps this control into an instance of GenericWebPart. If you want to access the properties and events of the controls you have added as web parts to your page, you can do this as you do usually. For example, if you want to catch the Calendar s SelectedDateChanged event of your previously created web part page, double-click the Calendar. You ll see your event procedure and can add some code. The following code shows an example that sets the previously added Calendar control s SelectedDate property on the first request to the page: protected void Page_Load(object sender, EventArgs e) { if (!this.IsPostBack) { MyCalendar.SelectedDate = DateTime.Now.AddDays(7); } ... } So, you have complete access to the controls added as web parts and don t have to do anything special here. But what if you want to access web part specific properties such as the title of the web part or web part specific events As mentioned, every web part that is not inherited from System.Web.UI.WebControls.WebParts.WebPart is wrapped automatically into an instance of GenericWebPart. If you want to access web part specific properties, you somehow have to retrieve

When configuring this connection point, you will recognize that the consumer WebPart always displays information from the selected entry of the CustomerNotes WebPart.

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Once you ve tweaked the hotspots to perfection, you can look at the source code to find the coordinates. In the case of a circle, three details are important: the X coordinate, Y coordinate, and radius. They appear in that order in the <area> tag: <area shape="circle" coords="272, 83, 83" ...> This tag defines the hotspot around the DVD region. The circle s center is at (272, 83), and the radius is 83 pixels. When defining a rectangle, you define the top-left and bottom-right corners. The order of coordinates is left X, top Y, right X, and bottom Y. When defining a polygon, you can have as many points as you like. The browser draws a line from one point to another to create the shape. You list the X and Y coordinates for your points in pairs like this: X1, Y1, X2, Y2, X3, Y3, and so on. It s recommended (according to the HTML standard) that you end with the same point with which you started. Once you ve determined your hotspots, you can add the corresponding HotSpot objects. Here s the ImageMap for Figure 30-1, with three hotspots: <asp:ImageMap ID="ImageMap1" runat="server" ImageUrl="~/cds.jpg"> <asp:CircleHotSpot AlternateText="DVDs" Radius="83" X="272" Y="83" /> <asp:CircleHotSpot AlternateText="Media" Radius="83" X="217" Y="221" /> <asp:CircleHotSpot AlternateText="CDs" Radius="83" X="92" Y="173" /> </asp:ImageMap> Rather than coding this by hand, you can select your ImageMap and click the ellipsis next to the HotSpots property in the Properties window. This opens a collection editor where you can add and modify each hotspot. Once you ve defined the hotspots, you can test them in a browser. When you move the mouse pointer over a hotspot, it changes into a hand. You ll also see that the alternate text you ve defined for the hotspot appears in a tooltip.

the web part and then set or get the properties you need. Fortunately, the WebPartManager class includes a WebParts collection property that contains all the web parts available for the page. The advantage of accessing web parts directly through the WebPartManager is that you don t have to know which WebPartZone they have been added to (remember that the user can change this as she wants). The following example uses the WebPartManager s WebParts collection to iterate through the web part and assign a default title for every web part that has been wrapped into a GenericWebPart class by the framework: protected void Page_Load(object sender, EventArgs e) { if (!this.IsPostBack) { int i = 1; foreach (WebPart part in MyPartManager.WebParts) { if (part is GenericWebPart) { part.Title = string.Format("Web Part Nr. {0}", i); i++; } } } ... } You can also modify other aspects through the web part properties. Table 30-2 shows some typical examples and gives you an overview of the most important properties of a WebPart control. Table 30-2. Important Properties of the WebPart Class

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