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For users, it was an awesome technology Developers, however, quickly found that creating and deploying Web Parts in SharePoint was a painstaking task I remember having to read for a week before even figuring out where to begin, and the book I read admitted that a successful deployment was a very difficult and error-prone process SharePoint was also tightly integrated with Active Directory, making it great for intranet applications but not for public-facing sites And you were pretty much stuck with the look and feel of a SharePoint portal because the page template support was awkward at best Something definitely needed to change Microsoft went back to the drawing board and revamped their portal framework The result of that endeavor is the Web Parts Framework in ASPNET 20, which was spectacularly implemented this time around.

Visual Studio shows all your views at design time, one after the other (see Figure 16-1). You can edit these regions in the same way you design any other part of the page.

Figure 16-1. Designing multiple views The MultiView.ActiveViewIndex determines what view will be shown. This is the only view that s rendered in the page. The default ActiveIndex value is -1, which means no view is shown. You need to set the ActiveIndex programmatically. One option is to use a list control that lets users choose from the full list of views. Here s some sample code that binds the list of views to a list box: protected void Page_Load(object sender, EventArgs e) { if (!Page.IsPostBack) { DropDownList1.DataSource = MultiView1.Views;

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Note Properties are different and more powerful than public data members. Properties provide an additional layer of abstraction through the use of get and set methods; get and set methods or function calls provide a convenient location for programming logic, such as displaying an error if a value is out of range or otherwise invalid, enforcing read-only access (implementing a get method only), and so on. Properties can be declared as public, protected, or private.

Building Web Parts is as simple as creating a user control or a custom server control Deploying a Web Part is as easy as dropping the Web Part in a folder and adding the control definition to a Web Part catalog All the drag-and-drop functionality for moving and reordering Web Parts is automatically added for you simply by dropping a WebPartManager control on your page Because the portal framework is part of ASPNET, it supports multiple authentication types and gives you complete control over page templates using Master Pages (see 3)..

DropDownList1.DataTextField = "ID"; DropDownList1.DataBind(); } } And here s the code that sets the current view based on the list index: protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e) { MultiView1.ActiveViewIndex = DropDownList1.SelectedIndex; } Figure 16-2 shows the result.

Figure 16-2. Switching views with a list control If you want to give the views more descriptive names, you simply fill the list box by hand. Just make sure the order matches the order of views. There s actually no need to write this code, because the MultiView includes some built-in smarts. Like some of the rich data controls, the MultiView recognizes specific command names in button controls. (A button control is any control that implements IButtonControl, including the Button, ImageButton, and LinkButton.) If you add a button control to the view that uses one of these recognized command names, the button will have some automatic functionality. Table 16-1 lists all the recognized command names. Each command name also has a corresponding static field in the MultiView class, so you can easily get the right command name if you choose to set it programmatically. Table 16-1. Recognized Command Names for the MultiView

chapter. Every page that uses Web Parts is required to have one (and only one) WebPartManager control to coordinate interactions between Web Parts and to manage all the Web Parts settings on the page.

Moves to the previous view. Moves to the next view. Moves to the view with a specific ID (string name). The ID is taken from the CommandArgument property of the button control.

Properties are easily viewable in the Properties window available when you select a control in the Visual Studio Design view of the .aspx page. Figure 1-4 shows the Properties window when the Name TextBox is selected. Notice that the Font property has been configured to show the TextBox s Text property text in italics.

Moves to the view with a specific numeric index. The index is taken from the CommandArgument property of the button control.

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