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Assigns anonymous users a fake identity. Verifies that the remote user has Microsoft Windows NT permissions to access the requested resource. Enables applications to use forms authentication.

You already know how to store control properties between postbacks, so this code shouldn t look new to you:

OutputCache PassportAuthentication Profile RoleManager ScriptModule SessionState UrlAuthorization UrlRouting WindowsAuthentication

The SelectedIndex property Property SelectedIndex() As Integer Get If not a postback, the value isn t in the ViewState collection. Dim objValue As Object = Me.ViewState( SelectedIndex ) If objValue Is Nothing Then Return 0 The default value Else Return CInt(objValue) End If End Get Set(ByVal Value As Integer) If Value >= 0 Then Me.ViewState( SelectedIndex ) = Value End If End Set End Property

Provides page output caching services. Provides a wrapper around Passport authentication services. Provides user profile services. Provides session-state services for the application. Used to implement page methods in AJAX pages. Provides session-state services for the application. Provides URL-based authorization services to access specified resources. Provides support for URL routing Enables ASP.NET applications to use Windows and Internet Information Services (IIS)-based authentication.

The list of default modules is defined in the machine.config file. By creating a proper web.config file, you can also create an application-specific list of modules. (Configuration is covered in 3, ASP.NET Configuration. )

The IPostBackDataHandler interface exposes only two methods, LoadPostData and RaisePostDataChangedEvent. For now let s focus on LoadPostData, the more important of the two. ASP.NET calls this method when a postback occurs and passes it the post collection that the form posted to itself:

The methods of the HttpApplication class can be divided into two groups: operational methods and event handler managers. The HttpApplication operational methods are described in Table 16-3.

Public Function LoadPostData(ByVal postDataKey As String, _ ByVal postCollection As NameValueCollection) As Boolean _ Implements IPostBackDataHandler.LoadPostData End Function

TABLE 16-3

Move the two buttons to the right of the Find Items By Name button so that your screen looks like this:

Part VI:

Sets an internal flag that causes ASP.NET to skip all successive steps in the pipeline and directly execute EndRequest. It s mostly useful to HTTP modules. Overridable method, cleans up the instance variables of all registered modules after the request has been served. At this time, Request, Response, Session, and Application are no longer available. Overridable method, returns the currently configured provider for handling output page caching. (I ll say more about output page caching in 18.) Overridable method, provides a way to set output caching based on a custom string for all pages in the application. (I ll say more about output page caching in 18.) Overridable method that executes custom initialization code after all modules have been linked to the application to serve the request. You can use it to create and configure any object that you want to use throughout the request processing. At this time, Request, Response, Session, and Application are not yet available.

Understanding how the postCollection argument is built is crucial. All ASP.NET forms use the POST action method and send the values of all the controls on the form in the request header. The postCollection argument passed to the LoadPostData method con tains the name and value pairs posted with the form, and the postDataKey argument is the key of the element in this collection that contains the new value of your custom control. (This argument is equal to the control s ID.) The value being posted back in the collection for the ComboBoxEx custom control is the value associated with the element that s currently selected in the combo box. Because each element in our custom combo box has a value equal to its index in the list, we can take this value from the collection and assign it to the SelectedIndex property: