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Notice how the code first checks to see if logging is enabled. There is no point using valuable processor cycles and memory generating log entries if they aren t going anywhere. The Filters section of the Logging block configuration can contain a special filter named the Log Enabled Filter (we have configured one in our example application). This filter has the single property, Enabled, that allows administrators to enable and disable all logging for the block. When it is set to False, the IsLoggingEnabled property of the LogWriter will return false as well. The example produces the following result. All of the events are sent to the General category, which is configured to write events to the Windows Application Event Log (this is the default configuration for the block).

protected void ListBox1_SelectedIndexChanged(object sender, EventArgs e) { this.Label1.Text = this. ListBox1.SelectedItem.Value; }

9 . . Drag a RadioButtonList onto the form, as shown in the following graphic . Visual Studio will ask you if you want to configure the control . First, select the Enable AutoPostBack check box . Then, click Choose Data Source .

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The region items are checked in the following order: 1 IRegionMemberLifetimeKeepAlive value 2 DataContext s IRegionMemberLifetimeKeepAlive value 3 RegionMemberLifetimeAttributeKeepAlive value 4 DataContext s RegionMemberLifetimeAttributeKeepAlive value Control-Specific Behaviors The SelectorItemsSourceSyncBehavior is used only for controls that derive from Selector, such as tab controls in WPF It is responsible for synchronizing the views in the region with the items of the selector, and then synchronizing the active views in the region with the selected items of the selector The TabControlRegionSyncBehavior is used for Silverlight only, and provides behavior that is similar to SelectorItemsSourceSyncBehavior for the Silverlight tab control Extending the Region Implementation The Prism Library provides extension points that allow you to customize or extend the default behavior of the provided APIs.

10 . . Configure the control to use SqlDataSource1 that you just added:

Created a Log Entry using the simplest overload. Created a Log Entry with a single category. Created a Log Entry with a category, priority, and event ID. Created a Log Entry with a category, priority, event ID, and severity. Created a Log Entry with a category, priority, event ID, severity, and title. Open Windows Event Viewer 'Application' Log to see the results.

11 . . Configure the control to use the AuthorLastName column for the text field and the Title column for the value field . Click OK .

For example, you can write your own region adapters, region behaviors, change the way the Navigation API parses URIs, or extend the Navigation API to work with Silverlight Frame Navigation For more information about extending the Prism Library, see Extending Prism on MSDN View composition is the constructing of a view In composite applications, views from multiple modules have to be displayed at run time in specific locations on the application UI To achieve this, you need to define the locations where the views will appear and how the views will be created and displayed in those locations..

12 . . Double-click the RadioButtonList1 object on the form to create a handler for the radio button selection . Handle the selection by updating the Label1 object with the value associated with the current radio button selection .

You can open Windows Event Viewer to see the results. Figure 3 shows the event generated by the last of the Write statements in this example.

protected void RadioButtonList1_SelectedIndexChanged(object sender, EventArgs e) { this.Label1.Text = this.RadioButtonList1.SelectedItem.Value; }

13 . . Run the program . The ListBox and the RadioButton list should show the AuthorLastName field, as shown in the following graphic . Selecting one name out of either list will cause a postback and show the title (the associated value) in the label .

Views can be created and displayed in the locations either automatically through view discovery, or programmatically through view injection These two techniques determine how individual views are mapped to named locations on the application UI View Discovery In view discovery, you set up a relationship in the RegionViewRegistry between a region s name and the type of a view When a region is created, the region looks for all the View Types associated with the region and automatically instantiates and loads the corresponding views Therefore, with view discovery, you do not have explicit control over when the views that correspond to a region are loaded and displayed View Injection In view injection, your code obtains a reference to a region, and then programmatically adds a view into it Typically, this is done when a module initializes or as a result of a user action.

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