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Custom server controls: Custom server controls are compiled classes that programmatically generate their own HTML Unlike user controls (which are declared like web-form pages in a plain-text file), server controls are always precompiled into DLL assemblies Depending on how you code the server control, you can render the content from scratch, inherit the appearance and behavior from an existing web control and extend its features, or build the interface by instantiating and configuring a group of constituent controls In this chapter, you ll explore the first option user controls User controls are a great way to standardize repeated content across all the pages in a website For example, imagine you want to provide a consistent way for users to enter address information on several different pages To solve this problem, you could create an address user control that combines a group of text boxes and a few related validators.

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.

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When you apply a theme to a page, ASP .NET considers each control on your web page and checks your skin files to see if they define any properties for that control. If ASP.NET finds a matching tag in the skin file, the information from the skin file overrides the current properties of the control. Figure 15-4 shows the result of applying the FunkyTheme to a simple page. The first picture shows the Themes.aspx page in its natural state, with no theme. The second picture shows the same page with the FunkyTheme applied. All the settings in FunkyTheme are applied to the controls in Themes.aspx, even if they overwrite values you ve explicitly set in the page (such as the background for the list box). However, details that were in the original page but that don t conflict with the theme (such as the custom font for the buttons) are left in place.

You could then add this address control to any web form and program against it as a single object User controls are also a good choice when you need to build and reuse site headers, footers, and navigational aids (Master pages, which are discussed in 15, complement user controls by giving you a way to standardize web-page layout) In all of these examples, you could avoid user controls entirely and just copy and paste the code wherever you need to do so However, if you do, you ll run into serious problems once you need to modify, debug, or enhance the controls in the future Because multiple copies of the user interface code will be scattered throughout your website, you ll have the unenviable task of tracking down each copy and repeating your changes Clearly, user controls provide a more elegant, object-oriented approach..

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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