Creating out-of-browser applications in Visual Basic .NET

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The NetworkInterface and NetworkChange classes included in the System.Net.NetworkInformation namespace provide access to the network state information. Typically, you ll use them together like this:
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NetworkChange.NetworkAddressChanged += new NetworkAddressChangedEventHandler(OnNetworkAddressChanged); ... void OnNetworkAddressChanged(object sender, EventArgs e) { if (NetworkInterface.GetIsNetworkAvailable()) { // Connected to some network } else { // Not connected to any network } }
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The call to GetIsNetworkAvailable will tell us only that there s some sort of network connection. It doesn t guarantee that we can access required services or even the Internet in general. On machines with network connections between the host and a virtual PC (VPC), which is typical in development environments, this may even detect the VPC connection as a valid network connection and return true. Rather than rely just on this call, it s a good practice to first check to see whether any network is available and, if so, ping or call a known service on the server you plan to reach before assuming you re connected. Since the network state can change during the application runtime, you may want to call these methods on a timer or in the exception handlers in your network service interface layer. One thing that can only happen when you re connected to the network is updating the application.
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A real benefit of browser-based applications is the ability to automatically update the application without requiring any sort of explicit installation or push to the client machine. Out-of-browser Silverlight applications aren t very different in that regard, except that the developer controls the update process. The Silverlight Application object includes a CheckAndDownloadUpdateAsync method that, as its name indicates, will check for any available .xap updates and download, if present. When the method completes, it fires the CheckAndDownloadUpdateCompleted event. The code is fairly simple and, if you use a little lambda expression sugar to create the delegate, you can even fit it all into a single short function:
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private void CheckForUpdates() { Application.Current.CheckAndDownloadUpdateCompleted += (s, e) => {
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if (e.UpdateAvailable) { MessageBox.Show("A new version was downloaded."); } }; Application.Current.CheckAndDownloadUpdateAsync(); }
When the CheckForUpdates call is made, Silverlight looks at the stored origin URI of the .xap file and makes a normal background HTTP request to that location to verify that the latest version is installed. If a new version is available, Silverlight will receive that in the background and programmatically indicate that a new version is available by setting the UpdateAvailable property to true in the returned event arguments class. Unless you prompt the user to shut down and relaunch the application, he ll still be running the old version. It s not until the next run that he ll execute the newly downloaded version. But, when you detect that a new version is available, you can display a dialog to the user and request a restart. If the nature of the application allows it, you can also be more draconian and completely block all of the UI functionality until the user restarts the application. What you can t do is force an application to restart programmatically. A best practice is to gently inform your user (perhaps soothing music and pastel colors will help) that a new version is available and let him restart at his convenience. At the worst, he ll get the new version during the next session. Once you ve decided to take your application out of the browser, one of the capabilities you ll enable is the notification API, introduced in Silverlight 4.
Alerting the user with Notification toast
Windows notifications have been nicknamed toast due to their way of popping up from the bottom right of the desktop, like a piece of toast in an old toaster. Notification is used for everything from displaying new email messages in Outlook, to new tweets in the popular Twitter programs, to new items in the queue of a business application. Notifications are an essential tool for alerting the user when the application is sitting in the background or on another screen. Creating a simple notification window is easy. All you need to do is create an instance of NotificationWindow, set the size, and set the content. The result will be less than stellar, though; it ll be a simple opaque white rectangle with your text overlaid:
if (Application.Current.IsRunningOutOfBrowser) { NotificationWindow notify = new NotificationWindow(); notify.Height = 75; notify.Width = 300; TextBlock text = new TextBlock(); text.Text = "Basic Notification"; notify.Content = text; notify.Show(5000); }
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