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Redirect() sends a redirect header to the client and so requires an extra round-trip) Here s the code that presents the list of selections when the page loads and then records the selection and transfers the page when a button is clicked: Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) If (Not PageIsPostBack) Then ' Fill the list box with available themes ' by reading the folders in the App_Themes folder Dim themeDir As New DirectoryInfo(ServerMapPath("App_Themes")) lstThemesDataTextField = "Name" lstThemesDataSource = themeDirGetDirectories() lstThemesDataBind() End If End Sub Protected Sub cmdApply_Click(ByVal sender As Object, ByVal e As EventArgs) ' Set the chosen theme Session("Theme") = lstThemesSelectedValue ' Refresh the page ServerTransfer(RequestFilePath) End Sub Figure 15-8 shows the resulting page..

NET 20, fill this gap Like CSS, themes allow you to define a set of style attributes that you can apply to controls in multiple pages However, unlike CSS, themes aren t implemented by the browser Instead, they re a native ASP NET solution that s implemented on the server Although themes don t replace styles, they have some features that CSS can t provide Here are the key differences: Themes are control-based, not HTML-based: As a result, themes allow you to define and reuse almost any control property For example, themes allow you to specify a set of common node pictures and use them in numerous TreeView controls or to define a set of templates for multiple GridView controls CSS is limited to style attributes that apply directly to HTML.

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You can specify where to find the associated code in several ways In previous versions of ASP NET, it was common to use the Src attribute to point to the source code file or the Inherits attribute to indicate a compiled class name However, both of these options have their idiosyncrasies For example, with the Inherits attribute, you re forced to always precompile your code, which is tedious (and can cause problems in development teams, because the standard option is to compile every page into a single DLL assembly) But the real problem is that both approaches force you to declare every web control you want to use with a member variable This adds a lot of boilerplate code In ASPNET 20, you can solve the problem using a new language feature called partial classes, which let you split a single class into multiple source code files.

If you use named skins, you can set the SkinID of a control declaratively when you design the page, or you can specify it dynamically in your code.

Themes are applied on the server: When a theme is applied to a page, the final styled page is sent to the user When a stylesheet is used, the browser receives both the page and the style information and then combines them on the client side Themes can be applied through configuration files: This lets you apply a theme to an entire folder or your whole website without modifying a single web page Themes don t cascade in the same way as CSS: Essentially, if you specify a property in a theme and in the individual control, the value in the theme overwrites the property in the control However, you have the choice of changing this behavior and giving precedence to the properties in the page, which makes themes behave more like stylesheets It would be overstating it to say that themes replace CSS Instead, themes represent a higherlevel model.

Essentially, the model is the same as before, but the control declarations are shuffled into a separate file You, the developer, never need to be distracted by this file instead you can just access your web-page controls by name Keen eyes will have spotted the word partial in the class declaration for your web-page code: public partial class TestFormCodeBehind : SystemWebUIPage { .. } With this bit of infrastructure in place, the rest is easy Your aspx page links to the source code file using the CodeFile attribute, as shown here: <%@ Page Language="C#" AutoEventWireup="true" CodeFile="TestFormCodeBehindaspxcs" Inherits="TestFormCodeBehind"%> Notice that Visual Studio uses a slightly unusual naming syntax for the source code file It has the full name of the corresponding web page, complete with the aspx extension, followed by the cs extension at the end.

Caution If you use named skins, you ll need to be careful that every theme uses the same names and provides tags for the same controls. If a control specifies the SkinID attribute and ASP.NET can t find a matching skin for that control in the theme, the control won t be themed, and it will keep its current formatting.

To implement your formatting properties, ASP NET will frequently render inline style.

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