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Figure 14-1. Testing the header user control In Visual Studio, you don t need to code the Register directive by hand. Instead, once you ve created your user control, simply select the .ascx in the Solution Explorer and drag it onto the drawing area of a web form. Visual Studio will automatically add the Register directive for you as well as an instance of the user control tag. The header control is the simplest possible user control example, but it can already provide some realistic benefits. Think about what might happen if you had to manually copy the header s HTML code into all your ASP.NET pages, and then you had to change the title, add a contact link, or something else. You would need to change and upload all the pages again. With a separate user control, you just update that one file. Best of all, you can use any combination of HTML, user controls, and server controls on an ASP.NET web form.

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.

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Stylesheets consist of rules. Each rule defines how a single ingredient in your web page should be formatted. For example, if you want to define a rule for formatting headings, you start by defining a rule with a descriptive name, like this: .heading1 { } Each rule name has two parts. The portion before the period indicates the tag to which the rule applies. In this example, nothing appears before the period, which means the rule can apply to any tag. The portion after the period is a unique name (called the CSS class name) that you choose to identify your rule. Once you ve defined a rule, you can add the appropriate formatting information. Here s an example the sets the heading1 style to a large sans-serif font with a green foreground color: .heading1 { font-weight: bold; font-size: large; color: limegreen; font-family: Verdana, Arial, Sans-Serif; }

The design-time support for user controls is greatly improved in ASP.NET 2.0. Now you can see a real representation of the user control at design time (rather than a blank gray box), and you can use the smart tag to quickly jump to the corresponding .ascx file. Best of all, when you add the user control to a web page, Visual Studio makes the corresponding user control object available to your code automatically, as you ll see in later examples.

ASP .NET is intelligent enough to catch if you try to use a skin name that doesn t exist, in which case you ll get a build warning. The control will then behave as though you set EnableTheming to false, which means it will ignore the corresponding default skin.

If hand-writing CSS rules seems like too much work, don t worry Visual Studio allows you to build a style rule using the same designer you use to format HTML tags. To use this feature, start by adding your rule declaration. Then, right-click between the two curly braces, and select Build Style. You ll see the familiar Style Builder dialog box where you can point and click your way to custom fonts, borders, backgrounds, and alignment.

Sometimes the easiest way to develop a user control is to put it in a web page first, test it on its own, and then translate the page to a user control. Even if you don t follow this approach, you might still end up with a portion of a user interface that you want to extract from a page and reuse in multiple places. Overall, this process is a straightforward cut-and-paste operation. However, you need to watch for a few points: Remove all <html>, <body>, and <form> tags. These tags appear once in a page, so they can t be added to user controls (which might appear multiple times in a single page). If there is a Page directive, change it to a Control directive and remove the attributes that the Control directive does not support, such as AspCompat, Buffer, ClientTarget, CodePage, Culture, EnableSessionState, EnableViewStateMac, ErrorPage, LCID, ResponseEncoding, Trace, TraceMode, and Transaction. If you aren t using the code-behind model, make sure you still include a class name in the Control directive by supplying the ClassName attribute. This way, the web page that consumes the control can be strongly typed, which allows it to access properties and methods you ve added to the control. Change the file extension from .aspx to .ascx.

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