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Finally, make sure the drop-down list shows the correct view when you use the buttons by adding this code to handle the MutliView.ActiveViewIndexChanged event: Protected Sub MultiView1_ActiveViewChanged(ByVal sender As Object, ByVal e As EventArgs) DropDownList1.SelectedIndex = MultiView1.ActiveViewIndex End Sub Now you can move from view to view using the buttons (see Figure 16-3).

Even if a master page is applied through the web.config, you have no guarantee that an individual page won t override your setting by supplying a MasterPageFile attribute in the Page directive. And if the MasterPageFile attribute is specified with a blank string, the page won t have any master page at all, regardless of what the web.config file specifies.

So far, the theme examples have applied relatively simple properties. However, you can create much more detailed control tags in your skin file. Most control properties support themes. If a property can t be declared in a theme, you ll receive a build error when you attempt to launch your application.

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The most important detail you need to know about the MultiView is that unlike the rich data controls (the GridView, FormsView, and so on), the MultiView is not a naming container This means that if you add a control named textBox1 to a view, you can t add another control named textBox1 to another view In fact, in terms of the page model, there s no real difference between controls you add to a view and controls in the rest of the page Either way, the controls you create will be accessible through member variables in your page class This means it s easy to configure a control in the second view when an event is raised by a control in the first view As a result, the pages you create using the MultiView tend to be heavier than normal pages.

Using what you ve learned, you can create and reuse master pages across your website. However, you can use other tricks and techniques to refine the way master pages work. In the following sections, you ll see how to interact with a master page from your content, how to set master pages dynamically, and how to nest one master page inside another.

Control developers can choose which properties you can set in a skin file by applying the Themeable attribute to the property declaration. If this attribute isn t present, the property can t be set in a theme. You ll learn more about custom control attributes in 28.

That s because the entire control model including the controls from every view is created on every postback and persisted to view state For the most part, this won t be a significant factor, unless you are manipulating a large number of controls programmatically (in which case you might want to turn EnableViewstate off for these controls) or you are using several data sources For example, if you have three views and each view has a different data source control, each time the page is posted back all three data source controls will perform their queries, and every view will be bound, including those that aren t currently visible To avoid this overhead, you can use the techniques described in 9, such as leaving your controls unbound and binding them programmatically, or canceling the binding process for views that aren t currently visible.

As you ve seen, the master page always specifies the basic HTML skeleton of the page, including the outermost <html> tag and the <head> portion This raises a potential problem Namely, what if the content page needs to supply information for the <head> section of the page, such as a page title One option is to define a ContentPlaceHolder in the <head> section of the page to wrap the appropriate tags However, this approach isn t valid, because the ContentPlaceHolder, like all ASP NET controls, needs to be nested inside a server-side <form> tag Fortunately, ASP NET provides a solution You can set the page title through the Title attribute of the Page directive The Title attribute overrides the title that s specified in the master page with something more appropriate for the particular content page Here s an example: <%@ Page Language="C#" MasterPageFile="~/SiteTemplatemaster" AutoEventWireup="true" CodeFile="SimpleContentPageaspx.

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