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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 an example, the Font settings set in the Properties window for the TextBox control described previously map directly to Font attributes: <asp:TextBox id="Name" runat="server" Font-Italic="True" ToolTip="Enter your name" OnTextChanged="Name_TextChanged"> </asp:TextBox> The Label and TextBox controls work a little differently than most, in that the content between the opening and closing tags is controlled by the Text property: <asp:Label id="Resultlabel" runat="server">Result Label</asp:Label> You can also set a control s properties programmatically in the code-behind class file The Hello, World demonstration sets the Text property for Label1 to a blank string each time the web form is loaded, to overwrite the Label value that is declaratively set in the aspx page The activity happens in a method named Page_Load that is mapped to the Page object s Load event: protected void Page_Load(object sender, EventArgs e) { ResultlabelText = ""; ChangeLabelText = ""; if (!Page.

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for the request. The HttpApplication object may come from a pool, or the HttpApplication Factory may need to create a new HttpApplication object if one isn t already available. After acquiring the appropriate HttpApplication object, ASP.NET can assign the thread processing the request an appropriate security context. By default, the thread inherits the same security context as the process in which it runs, meaning that the thread normally runs using the same security context as the ASP.NET worker process. If you have impersonation enabled, then the worker process assigns the thread a security context based on your configuration settings in Web.config. If you re using applicationwide impersonation, then ASP.NET assigns the thread the security context of the account you have configured for the application. If you re using user-based impersonation, then ASP.NET assigns the thread a security context using the access token it received from IIS. Next, ASP.NET runs through all the modules for the HttpApplication object acquired from the Application Factory. An HTTP module is a class that implements the IHttpModule interface. In the next sections, you ll learn about the Authentication, UrlAuthorization, and File Authorization HTTP modules.

Of course, not all uses of the MultiView need to involve data binding The perfect scenario for the MultiView is an extended set of input controls for example, an online survey form that s split into separate views just to spare the user a lot of scrolling This example works well with the MultiView because at the end when the survey is complete, you can read all the data from the controls of every view..

By default, the Wizard control supplies navigation buttons and a sidebar with links for each step on the left. You can hide the sidebar by setting the Wizard.DisplaySideBar property to false. Usually, you ll take this step if you want to enforce strict step-by-step navigation and prevent the user from jumping out of sequence. You supply the content for each step using any HTML or ASP .NET controls. Figure 16-4 shows the region where you can add content to an out-of-the-box Wizard instance.

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