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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.

Summary

ASP.NET doesn t ship with any predefined themes. That means you ll need to create your own from scratch or download sample themes from other websites such as http://www.asp.net.

Summary

In this chapter, you learned how to use the .NET classes for retrieving file system information. You also examined how to work with files and how to serialize objects. Along the way you learned how data binding can work with the file classes, how to plug security holes with the Path class, and how to deal with file contention in multiuser scenarios. You also considered data compression using GZIP .

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To add a theme to your project, select Website Add New Item and choose Skin File. Visual Studio will warn you that skin files need to be placed in a subfolder of the App_Themes folder and will ask you if that s what you intended. If you choose Yes, Visual Studio will create a folder with the same name as your theme file. You can then rename the folder and the file to whatever you d like to use. Figure 15-3 shows an example with a theme that contains a single skin file.

he core set of ASPNET controls is broad and impressive It includes controls that encapsulate basic HTML tags and controls that provide a rich higher-level model, such as the Calendar, TreeView, and data controls Of course, even the best set of controls can t meet the needs of every developer Sooner or later, you ll want to get under the hood, start tinkering, and build your own user interface components In NET, you can plug into the web forms framework with your own controls in two ways You can develop either of the following: User controls: A user control is a small section of a page that can include static HTML code and web server controls The advantage of user controls is that once you create one, you can reuse it in multiple pages in the same web application You can even add your own properties, events, and methods.

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.

Visual Studio doesn t include any design-time support for creating themes, so it s up to you to copy and paste control tags from other web pages. Here s a sample skin that sets background and foreground colors for several common controls: <asp:ListBox runat="server" ForeColor="White" BackColor="Orange"/> <asp:TextBox runat="server" ForeColor="White" BackColor="Orange"/> <asp:Button runat="server" ForeColor="White" BackColor="Orange"/> To apply the theme in a web page, you need to set the Theme attribute of the Page directive to the folder name for your theme. (ASP.NET will automatically scan all the skin files in that theme.) <%@ Page Language="vb" AutoEventWireup="true" ... Theme="FunkyTheme" %> You can make this change by hand, or you can select the DOCUMENT object in the Properties window at design time and then set the Theme property (which provides a handy drop-down list of all your web application s themes). Visual Studio will modify the Page directive accordingly.

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