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It is easy to add custom region behaviors or replace existing behaviors, either on a system-wide or a per-region basis The next sections describe the default behaviors that are automatically added to all regions One behavior, the SelectorItemsSourceSyncBehavior, is only attached to controls that derive from the Selector Registration Behavior The RegionManagerRegistrationBehavior is responsible for making sure that the region is registered with the correct RegionManager When a view or control is added to the visual tree as a child of another control or region, any region defined in the control should be registered in the RegionManager of the parent control When the child control is removed, the registered region is unregistered Auto-Population Behavior There are two classes responsible for implementing view discovery One of them is the AutoPopulateRegionBehavior When it is attached to a region, it retrieves all view types that are registered under the name of the region.

3 . . Select all the columns and all the rows from the DotNetReferences table when configuring the query; that is, select the asterisk (*) to query for all the columns . Click Next .

// Check if logging is enabled before creating log entries. if (defaultWriter.IsLoggingEnabled()) { defaultWriter.Write("Log entry created using the simplest overload."); defaultWriter.Write("Log entry with a single category.", "General");

4 . . If you want to, test the query by clicking the Test Query button, or click Finish:

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5 . . Set the DataSourceMode property of the data source to DataReader . You can do this by clicking the data source control in the Designer, and then modifying the property in the Properties pane . 6 . . Drag a ListBox onto the page . Set the AutoPostBack property to true by selecting the check box in the Tasks pane . You could also click Choose Data Source in the ListBox Tasks pane . In practice, this is what you would do most likely . However, here add the code to perform the data binding by hand so that you see how it s done in code . In the code view, locate the Page_Load method and attach the ListBox DataSource property to SqlDataSource1 like so:

It then creates instances of those views and adds them to the region After the region is created, the AutoPopulateRegionBehavior monitors the RegionViewRegistry for any newly registered view types for that region name If you want to have more control over the view discovery process, consider creating your own implementation of the IRegionViewRegistry and the AutoPopulateRegion Behavior Region Context Behaviors The region context functionality is contained within two behaviors: the SyncRegionContext WithHostBehavior and the BindRegionContextToDependencyObjectBehavior These behaviors are responsible for monitoring changes to the context that were made on the region, and then synchronizing the context with a context dependency property attached to the view..

protected void Page_Load(object sender, EventArgs e) { if (!this.IsPostBack) { this.ListBox1.DataSource = this.SqlDataSource1; this.ListBox1.DataTextField = "AuthorLastName"; this.ListBox1.DataValueField = "Title"; this.ListBox1.DataBind(); } }

defaultWriter.Write("Log entry with a category, priority, and event ID.", "General", 6, 9001); defaultWriter.Write("Log entry with a category, priority, event ID, " + "and severity.", "General", 5, 9002, TraceEventType.Warning); defaultWriter.Write("Log entry with a category, priority, event ID, " + "severity, and title.", "General", 8, 9003, TraceEventType.Warning, "Logging Block Examples"); } else { Console.WriteLine("Logging is disabled in the configuration."); }

. .

Activation Behavior The RegionActiveAwareBehavior is responsible for notifying a view if it is active or inactive The view must implement IActiveAware to receive these change notifications This active aware notification is one-directional (it travels from the behavior to the view) The view cannot affect its active state by changing the active property on the IActiveAware interface Region Lifetime Behavior The RegionMemberLifetimeBehavior is responsible for determining if an item should be removed from the region when it is deactivated The RegionMemberLifetimeBehavior monitors the region s ActiveViews collection to discover items that transition into a deactivated state The behavior checks the removed items for IRegionMemberLifetime or the RegionMemberLifetimeAttribute (in that order) to determine if it should be kept alive after removal If the item in the collection is a SystemWindowsFrameworkElement, the behavior will also check its DataContext for IRegionMemberLifetime or the RegionMember LifetimeAttribute.

7 . . Insert a label below the ListBox to hold the selected value from the ListBox . 8 . . Double-click ListBox1 to insert an item changed event handler in your code . In the event handler, set the Label1 text property to the value field of the selected item .

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