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A sample data source can be thought of as a minidatabase in which a developer can define multiple collections, custom properties, property data types, data type lengths, and the format of the data. This section will cover the options related to modifying sample data sources. When you have created a sample data source, several management options are available to you. By default, a Collection property is created that holds a simple string property. One of the first things you will want to do is rename or remove these objects. You can double-click any of the property names, and this will make the text of the property editable. Figure A-5 shows the Collection property in edit mode. When a property is in edit mode, the name can be changed.

queuing_order conversation_group_id conversation_handle message_sequence_number service_name service_id service_contract_name

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When you are running a locally installed application, you may want to add application logic that allows the application to behave reasonably well in the absence of network connectivity. Silverlight 3 adds support in the framework for sensing network connectivity. As network state changes during the lifetime of your application, you can handle the static NetworkAddressChanged event in the System.Net.NetworkInformation.NetworkChange class, to receive network-change notifications from the runtime. This event is raised any time any one of your computer s existing network interfaces goes through a network address change. However, not all such notifications indicate unavailability of a network connection; they may indicate a transition from one valid network address to another. To determine if a valid network connection is available, in the event handler of the NetworkAddressChanged event (and anywhere else in your code), you can invoke the static GetIsNetworkAvailable() method in the System.Net. NetworkInformation.NetworkInterface class. This method returns true if a valid network connection is available or false if not.

Warning When naming your properties, try to stay away from certain keywords. For example, naming a property Name will cause problems for you when the property is used in a binding in the application.

bigint uniqueidentifier uniqueidentifier bigint nvarchar(512) int nvarchar(256)

The new local installation deployment model also adds support for application-initiated self updates for application code. The related API lets you check for updates to the application code at the site of origin and asynchronously download the changes. The Application.CheckAndDownloadUpdateAsync() method checks for any updates to the application code at the site of origin. If it finds updated code, the updated bits are downloaded to the local machine s application cache asynchronously. The Application.CheckAndDownloadUpdateCompleted event is raised when the download process completes or if the check reveals no changes. The CheckAndDownloadUpdatedCompletedEventArgs. UpdateAvailable property is set to true if updates were downloaded or false if no updates were available. To apply the updates, the user needs to restart the application. Listing 7-33 shows a possible use of the application-update feature.

int nvarchar(256) int nchar(2)

The sample data source provides several management options to configure a data source. These options can be displayed as drop-down menu items from the right-hand side. Figure A-6 highlights the available data source management options.

Listing 7-33. Code to Update an Application with Changes private void Application_Startup(object sender, StartupEventArgs e) { if(Application.Current.InstallState == InstallState.Installed && Application.Current.IsRunningOutOfBrowser && NetworkInterface.GetIsNetworkAvailable()) { Application.Current.CheckAndDownloadUpdateCompleted+= new CheckAndDownloadUpdateCompletedEventHandler((s,args)=> { if (args.UpdateAvailable) { MessageBox.Show("New updates are available for this application." + "Please restart the application to apply updates.","Update Status", MessageBoxButton.OK); this.RootVisual = new CheckUpdatePage(); } else this.RootVisual = new MainPage(); }); Application.Current.CheckAndDownloadUpdateAsync(); } else this.RootVisual = new MainPage(); } As shown in Listing 7-33, you check to see if the application is running from a locally installed version out of the browser and has network connectivity. If so, you proceed to invoke CheckAndDownloadUpdatesAsync(). In the CheckAndDownloadUpdateCompleted handler, you check to see if updates are available. If there are updates, you display an appropriate message and use a different root visual to prevent the main application from running without the updates being applied. Note that whether you want to enforce the download of an available update depends on application logic specified as shown in Listing 7-33. Should you choose to, you can let the user continue without applying the update, as long as your application can function as an older version without causing any errors.

The ID of the contract for the conversation. The name of the message type for the message. The ID of the message type for the message. The type of validation used for the message. The possible values are as follows: E: Empty N: None X: XML The body of the message. The ID of the message.

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