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Figure 2-21. Attaching an event handler Visual Studio 2005 uses automatic event wire-up, as indicated in the Page directive. Automatic event wire-up has two basic principles: All page event handlers are connected automatically based on the name of the event handler. In other words, the Page_Load() method is automatically called when the page loads. Visual Studio adds a comment to your page class to point out the commonly used event methods. All control event handlers are connected using attributes in the control tag. The attribute has the same name as the event, prefixed by the word On. For example, if you want to handle the Click event of the Button control, you simply need to set the OnClick attribute in the control tag with the name of the event handler you want to use. Here s the change you need: <asp:Button id="cmdOK" OnClick="txtName_Click" runat="server"> ASP.NET controls always use this syntax. Remember, because ASP .NET must connect the event handlers, the derived page class must be able to access the code-behind class. This means your event handlers must be declared with the protected or public keyword. (Protected is preferred, because it prevents other classes from seeing this method.) Of course, if you re familiar with .NET events, you know there s another approach to connect an event handler. You can do it dynamically through code using delegates. Here s an example: cmdOK.Click += new EventHandler(txtName_Click); This approach is useful if you re creating controls on the fly. You ll see this technique in action in 3.

If you use the same user control in ten different pages, ASP .NET will cache ten separate versions of that control. This gives each page the chance to customize the user control the first time is executed, before the user control is cached. However, in many cases you might find that you reuse the same user control on multiple pages and you don t need to introduce page-specific customizations. In this case, you can save memory by telling ASP .NET to share the cached copy of the control. ASP.NET enables this scenario through the Shared property of the OutputCache directive. The Shared property works only when you are applying the directive to a user control, not a web form. Here s an example: <%@ OutputCache Duration="10" VaryByParam="None" Shared="True" %> You can also make the same request by adding the PartialCaching attribute to the class declaration for the user control: [PartialCaching(10, null, null, null, true)] public class MyUserControl : UserControl { ... } The null parameters here represent VaryByParameter, VaryByControl, and VaryByCustom.

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goes through the available tokens, creating nodes along the way. calls an external function that understands the tag s for that tag. object as its attribute.

Summary

In this chapter, you learned how to create some simple and some sophisticated user controls. You also saw how to load user controls dynamically and how to cache them. Though user controls are easy to create, they don t solve every custom control challenge. In fact, user controls are quite limited in scope (they can t be easily shared across applications), and they have limited design-time support (for example, you can t attach event handlers in the Properties window). User controls also lack advanced features and aren t well suited to rendering HTML and JavaScript on the fly. To improve on this situation, you can step up to custom controls, which are much more sophisticated and quite a bit more complicated to create. 27 describes custom controls.

Although server controls are more powerful than user controls, most of the concepts you ve learned in this chapter apply to server controls in the same way that they apply to user controls. For example, you can create server controls that include properties and methods, use custom objects, fire events, and expose child controls.

uilding a professional web application involves much more than designing individual web pages. You also need the tools to integrate your web pages into a complete, unified website. In this chapter, you ll consider two new ASP.NET features that let you do that. First up is a feature called themes, which let you define the formatting details for various controls and seamlessly reuse these formats in multiple pages. Themes make it much easier to standardize your website s look and feel and tweak it later. Once a theme is in place, you can give your entire website a face-lift just by changing the theme definition. A more impressive innovation is master pages, which let you create reusable page templates. Using a master page, you can define the layout for your website pages, complete with all the usual details such as headers, menu bars, and ad banners. Once you ve formalized this structure, you can use the master page throughout your website, ensuring that all pages have the same design. Visitors can then surf from one section to another without noticing any change. In this chapter, you ll learn how to use themes and master pages, two features that are new in ASP .NET 2.0, to standardize your websites.

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