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    <p>1) In the main page XAML file, MainPage.xaml, add the following code in the StackPanel element, below the Button element named ShutterButton. This code is the button for the camera flash.</p> <pre><code>&lt;Button Name="FlashButton" Content="Fl:TBD" Click="changeFlash_Clicked" FontSize="26" FontWeight="ExtraBold" Height="75"/&gt; </code></pre> <p>2) Open the code-behind file for the main page, MainPage.xaml.cs, and add the following variable declarations above the MainPage class constructor:</p> <p>// Holds current flash mode.</p> <pre><code>private string currentFlashMode; </code></pre> <p>3) In MainPage.xaml.cs, add the following code to the OnNavigatedTo method, just below the Disable UI comment.</p> <pre><code>FlashButton.IsEnabled = false; </code></pre> <p>4) In MainPage.xaml.cs, add the following code to the cam_Initialized method, just below the txtDebug statement:</p> <p>// Set flash button text.</p> <pre><code>FlashButton.Content = "Fl:" + cam.FlashMode.ToString(); </code></pre> <p>This code displays the current flash mode on the FlashButton button.</p> <p>5) In MainPage.xaml.cs, add the following code to the MainPage class. This code implements the event handler for changeFlash_Clicked by switching to a different flash mode each time the button is pressed.</p> <pre><code>// Activate a flash mode. // Cycle through flash mode options when the flash button is pressed. private void changeFlash_Clicked(object sender, RoutedEventArgs e) { switch (cam.FlashMode) { case FlashMode.Off: if (cam.IsFlashModeSupported(FlashMode.On)) { // Specify that flash should be used. cam.FlashMode = FlashMode.On; FlashButton.Content = "Fl:On"; currentFlashMode = "Flash mode: On"; } break; case FlashMode.On: if (cam.IsFlashModeSupported(FlashMode.RedEyeReduction)) { // Specify that the red-eye reduction flash should be used. cam.FlashMode = FlashMode.RedEyeReduction; FlashButton.Content = "Fl:RER"; currentFlashMode = "Flash mode: RedEyeReduction"; } else if (cam.IsFlashModeSupported(FlashMode.Auto)) { // If red-eye reduction is not supported, specify automatic mode. cam.FlashMode = FlashMode.Auto; FlashButton.Content = "Fl:Auto"; currentFlashMode = "Flash mode: Auto"; } else { // If automatic is not supported, specify that no flash should be used. cam.FlashMode = FlashMode.Off; FlashButton.Content = "Fl:Off"; currentFlashMode = "Flash mode: Off"; } break; case FlashMode.RedEyeReduction: if (cam.IsFlashModeSupported(FlashMode.Auto)) { // Specify that the flash should be used in the automatic mode. cam.FlashMode = FlashMode.Auto; FlashButton.Content = "Fl:Auto"; currentFlashMode = "Flash mode: Auto"; } else { // If automatic is not supported, specify that no flash should be used. cam.FlashMode = FlashMode.Off; FlashButton.Content = "Fl:Off"; currentFlashMode = "Flash mode: Off"; } break; case FlashMode.Auto: if (cam.IsFlashModeSupported(FlashMode.Off)) { // Specify that no flash should be used. cam.FlashMode = FlashMode.Off; FlashButton.Content = "Fl:Off"; currentFlashMode = "Flash mode: Off"; } break; } // Display current flash mode. this.Dispatcher.BeginInvoke(delegate() { txtDebug.Text = currentFlashMode; }); } </code></pre>
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    1. POTurn on camera flash in WP7
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