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To make it even easier to create a new content page, let Visual Studio guide you. Just select Website Add New Item from the menu. Select Web Form, click the Select Master Page File check box, and click OK. Visual Studio will prompt you to choose a master page file from your current web project. When you take this step, Visual Studio automatically creates a Content control for every ContentPlaceHolder in the master page.

One important detail to remember is that the user control s constituent controls can be accessed only by the user control. That means the web page that hosts the user control can receive the events, set the properties, or call the methods of these contained controls. For example, in the TimeDisplay user control the web page has no ability to access the LinkButton control that it uses. Usually, this behavior is exactly what you want. It means your user control can add public properties to expose specific details without giving the web page free reign to tamper with everything and potentially introduce invalid or inconsistent changes. For example, if you want to give the web page the ability to tweak the foreground color of the LinkButton control, you might add a ForeColor property to your user control. Here s an example: public Color ForeColor { get { return lnkTime.ForeColor; } set { lnkTime.ForeColor = value; } } To change the foreground color in your web-page code, you would now use code like this: TimeDisplay1.ForeColor = System.Drawing.Color.Green; This example maps the lnkTime.ForeColor property to the ForeColor property of the user control. This trick is usually the best approach, but it can become tedious if you need to expose a large number of properties. For example, your user control might render a table, and you might want to let the user configure the formatting of each table cell. In this case, it might make sense to expose the complete control object. Here s an example that exposes the lnkTime control for the TimeDisplay user control: public LinkButton InnerLink { get { return lnkTime; } }

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Thus, to create a complete content page that uses the SiteTemplate master page, you simply need to fill in the content for the ContentPlaceHolder with the ID ContentPlaceHolder1. Here s an example that shows the complete page code: <%@ Page Language="vb" MasterPageFile="~/SiteTemplate.master" AutoEventWireup="true" CodeFile="SimpleContentPage.aspx.vb" Inherits="SimpleContentPage" Title="Untitled Page" %> <asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1" runat="Server"> <span style="...">Far out in the uncharted backwaters of the unfashionable end of the western spiral arm of the Galaxy lies a small unregarded yellow sun. </span> </asp:Content> As you can see, content pages are refreshingly clean, because they don t include any of the details defined in the master page. Even better, this makes it easy to update your website. All you need to is modify a single master page. As long as you keep the same ContentPlaceHolder controls, the existing content pages will keep working and will fit themselves into the new layout wherever you specify. Figure 15-11 shows this sample content page.

Using named themes is similar to using CSS rules that are based on class name (as shown at the beginning of this chapter). CSS class rules are applied only if you set the class attribute of the corresponding HTML tag.

Notice that you need to use a read-only property, because it s not possible for the web page to replace the control with something different. Now this is how you would set the foreground color in the hosting page: TimeDisplay1.InnerLink.ForeColor = System.Drawing.Color.Green; Keep in mind that when you use this practice, you expose all the details of the inner control. This means the web page can call methods and receive events from that control. This approach gives unlimited flexibility, but it reduces the reusability of the code. It also increases the chance that your web page will become tightly coupled to the internal details of the current implementation of your control, thereby making it less likely that you can revise or enhance the user control without disrupting the web pages that use it. As a general rule, it s always better to create dedicated methods, events, and properties to expose just the functionality you need, rather than opening a back door that could be used to create messy workarounds.

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