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diff --git a/print/v4PrintDriverSamples/PrinterExtensionSample/ExtensionSample/App.xaml.cs b/print/v4PrintDriverSamples/PrinterExtensionSample/ExtensionSample/App.xaml.cs
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+// THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF
+// ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO
+// THE IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A
+// PARTICULAR PURPOSE.
+//
+// Copyright (c) Microsoft Corporation. All rights reserved
+//
+//
+// Abstract:
+//
+//     This file contains the entry point to the application.
+
+using System;
+using System.Windows;
+using System.Runtime;
+
+using Microsoft.Samples.Printing.PrinterExtension.Types;
+using Microsoft.Samples.Printing.PrinterExtension.Helpers;
+
+using System.Windows.Interop;
+
+namespace Microsoft.Samples.Printing.PrinterExtension
+{
+    /// <summary>
+    /// Interaction logic for App.xaml.
+    /// </summary>
+    public partial class App : Application
+    {
+        /// <summary>
+        /// This is the event handler invoked on various driver events.
+        /// </summary>
+        /// <param name="sender"></param>
+        /// <param name="eventArgs"></param>
+        private static void OnDriverEvent(object sender, PrinterExtensionEventArgs eventArgs)
+        {
+            //
+            // Display the print preferences window.
+            //
+
+            if (eventArgs.ReasonId.Equals(PrinterExtensionReason.PrintPreferences))
+            {
+                PrintPreferenceWindow printPreferenceWindow = new PrintPreferenceWindow();
+                printPreferenceWindow.Initialize(eventArgs);
+
+                //
+                // Set the caller application's window as parent/owner of the newly created printing preferences window.
+                //
+
+                WindowInteropHelper wih = new WindowInteropHelper(printPreferenceWindow);
+                wih.Owner = eventArgs.WindowParent;
+
+                //
+                // Display a modal/non-modal window based on the 'WindowModal' parameter.
+                //
+
+                if (eventArgs.WindowModal)
+                {
+                    printPreferenceWindow.ShowDialog();
+                }
+                else
+                {
+                    printPreferenceWindow.Show();
+
+                    // Flash the window to draw the user's attention. This is required
+                    // because the printer extension may be drawn behind the parent window.
+                    // The return value of FlashWindow can be safely ignored if there is no need
+                    // to know if the window has focus or not.
+                    WindowHelper.FlashWindow(wih.Handle);
+                }
+            }
+            else if (eventArgs.ReasonId.Equals(PrinterExtensionReason.DriverEvent))
+            {
+                //
+                // Handle driver events here.
+                //
+            }
+        }
+
+        /// <summary>
+        /// Perform initialization tasks for the printer extension in this event handler.
+        /// </summary>
+        /// <param name="sender"></param>
+        /// <param name="e"></param>
+        private void Application_Startup(object sender, StartupEventArgs e)
+        {
+            //
+            // It is recommended that exactly one instance of the PrinterExtensionManager be created per instance of
+            // the printer extension.
+            //
+
+            if (manager != null)
+            {
+                return;
+            }
+            manager = new PrinterExtensionManager();
+
+            //
+            // Enable events to be received on one printer driver id.
+            //
+            // Note: The order of adding the delegate to PrinterExtensionManager.OnDriverEvent
+            //       and invoking PrinterExtensionManager::EnableEvents is important.
+            //       Adding the delegate should be done first.
+            //
+
+            manager.OnDriverEvent += OnDriverEvent;
+
+            //
+            // It is recommended that an instance of a printer extension invoke PrinterExtensionManager::EnableEvents
+            // for exactly one printer driver id. The printer driver id could come in from a command line argument,
+            // thereby allowing one application binary to dynamically invoke PrinterExtensionManager::EnableEvents against
+            // the appropriate printer driver id.
+            //
+
+            manager.EnableEvents(Guid.Parse(PrinterDriverID));
+        }
+
+        /// <summary>
+        /// Perform uninitialization tasks for the printer extension in this event handler.
+        /// </summary>
+        /// <param name="sender"></param>
+        /// <param name="e"></param>
+        private void Application_Exit(object sender, ExitEventArgs e)
+        {
+            manager.OnDriverEvent -= OnDriverEvent;
+            manager.DisableEvents();
+
+            manager = null;
+        }
+
+        /// <summary>
+        /// This is the printer driver id, as defined in the printer driver manifest file.
+        /// Please replace this GUID with the printer driver id from your manifest file.
+        ///
+        /// It is recommended that you invoke PrinterExtensionManager::EnableEvents() on exactly
+        /// one printer driver id. The id could come in from a command line argument, thereby enabling
+        /// one application binary to work with multiple printer driver ids.
+        /// </summary>
+        private const string PrinterDriverID = "{E0691E8D-F7CC-456E-A7B5-D1FC19BA2279}";
+
+        /// <summary>
+        /// Instance of the PrinterExtensionManager. It is recommended that you have only instance
+        /// of the PrinterExtensionManager per application instance.
+        /// </summary>
+        private static PrinterExtensionManager manager = null;
+    }
+}