diff --git a/Chapter04/Complete/MyMediaCollection/App.xaml.cs b/Chapter04/Complete/MyMediaCollection/App.xaml.cs
index 3eb7fec..e41d7da 100644
--- a/Chapter04/Complete/MyMediaCollection/App.xaml.cs
+++ b/Chapter04/Complete/MyMediaCollection/App.xaml.cs
@@ -33,7 +33,7 @@ namespace MyMediaCollection
         /// Invoked when the application is launched.
         /// </summary>
         /// <param name="args">Details about the launch request and process.</param>
-        protected override void OnLaunched(Microsoft.UI.Xaml.LaunchActivatedEventArgs args)
+        protected override void OnLaunched(LaunchActivatedEventArgs args)
         {
             m_window = new MainWindow();
             var rootFrame = new Frame();
diff --git a/Chapter05/Complete/MyMediaCollection/App.xaml.cs b/Chapter05/Complete/MyMediaCollection/App.xaml.cs
index 3eb7fec..e41d7da 100644
--- a/Chapter05/Complete/MyMediaCollection/App.xaml.cs
+++ b/Chapter05/Complete/MyMediaCollection/App.xaml.cs
@@ -33,7 +33,7 @@ namespace MyMediaCollection
         /// Invoked when the application is launched.
         /// </summary>
         /// <param name="args">Details about the launch request and process.</param>
-        protected override void OnLaunched(Microsoft.UI.Xaml.LaunchActivatedEventArgs args)
+        protected override void OnLaunched(LaunchActivatedEventArgs args)
         {
             m_window = new MainWindow();
             var rootFrame = new Frame();
diff --git a/Chapter05/Start/MyMediaCollection/App.xaml.cs b/Chapter05/Start/MyMediaCollection/App.xaml.cs
index 3eb7fec..e41d7da 100644
--- a/Chapter05/Start/MyMediaCollection/App.xaml.cs
+++ b/Chapter05/Start/MyMediaCollection/App.xaml.cs
@@ -33,7 +33,7 @@ namespace MyMediaCollection
         /// Invoked when the application is launched.
         /// </summary>
         /// <param name="args">Details about the launch request and process.</param>
-        protected override void OnLaunched(Microsoft.UI.Xaml.LaunchActivatedEventArgs args)
+        protected override void OnLaunched(LaunchActivatedEventArgs args)
         {
             m_window = new MainWindow();
             var rootFrame = new Frame();
diff --git a/Chapter06/Complete/MyMediaCollection/App.xaml.cs b/Chapter06/Complete/MyMediaCollection/App.xaml.cs
index f4fad86..9abf296 100644
--- a/Chapter06/Complete/MyMediaCollection/App.xaml.cs
+++ b/Chapter06/Complete/MyMediaCollection/App.xaml.cs
@@ -33,7 +33,7 @@ namespace MyMediaCollection
         /// Invoked when the application is launched.
         /// </summary>
         /// <param name="args">Details about the launch request and process.</param>
-        protected override async void OnLaunched(Microsoft.UI.Xaml.LaunchActivatedEventArgs args)
+        protected override async void OnLaunched(LaunchActivatedEventArgs args)
         {
             m_window = new MainWindow();
             var rootFrame = new Frame();
diff --git a/Chapter06/Start/MyMediaCollection/App.xaml.cs b/Chapter06/Start/MyMediaCollection/App.xaml.cs
index 3eb7fec..e41d7da 100644
--- a/Chapter06/Start/MyMediaCollection/App.xaml.cs
+++ b/Chapter06/Start/MyMediaCollection/App.xaml.cs
@@ -33,7 +33,7 @@ namespace MyMediaCollection
         /// Invoked when the application is launched.
         /// </summary>
         /// <param name="args">Details about the launch request and process.</param>
-        protected override void OnLaunched(Microsoft.UI.Xaml.LaunchActivatedEventArgs args)
+        protected override void OnLaunched(LaunchActivatedEventArgs args)
         {
             m_window = new MainWindow();
             var rootFrame = new Frame();
diff --git a/Chapter07/Complete/MyMediaCollection/App.xaml.cs b/Chapter07/Complete/MyMediaCollection/App.xaml.cs
index a7faf93..8c97f29 100644
--- a/Chapter07/Complete/MyMediaCollection/App.xaml.cs
+++ b/Chapter07/Complete/MyMediaCollection/App.xaml.cs
@@ -33,7 +33,7 @@ namespace MyMediaCollection
         /// Invoked when the application is launched.
         /// </summary>
         /// <param name="args">Details about the launch request and process.</param>
-        protected override async void OnLaunched(Microsoft.UI.Xaml.LaunchActivatedEventArgs args)
+        protected override async void OnLaunched(LaunchActivatedEventArgs args)
         {
             m_window = new MainWindow();
             var rootFrame = new Frame();
diff --git a/Chapter07/Start/MyMediaCollection/App.xaml.cs b/Chapter07/Start/MyMediaCollection/App.xaml.cs
index f4fad86..9abf296 100644
--- a/Chapter07/Start/MyMediaCollection/App.xaml.cs
+++ b/Chapter07/Start/MyMediaCollection/App.xaml.cs
@@ -33,7 +33,7 @@ namespace MyMediaCollection
         /// Invoked when the application is launched.
         /// </summary>
         /// <param name="args">Details about the launch request and process.</param>
-        protected override async void OnLaunched(Microsoft.UI.Xaml.LaunchActivatedEventArgs args)
+        protected override async void OnLaunched(LaunchActivatedEventArgs args)
         {
             m_window = new MainWindow();
             var rootFrame = new Frame();
diff --git a/Chapter08/Start/MyMediaCollection/App.xaml.cs b/Chapter08/Start/MyMediaCollection/App.xaml.cs
index a7faf93..8c97f29 100644
--- a/Chapter08/Start/MyMediaCollection/App.xaml.cs
+++ b/Chapter08/Start/MyMediaCollection/App.xaml.cs
@@ -33,7 +33,7 @@ namespace MyMediaCollection
         /// Invoked when the application is launched.
         /// </summary>
         /// <param name="args">Details about the launch request and process.</param>
-        protected override async void OnLaunched(Microsoft.UI.Xaml.LaunchActivatedEventArgs args)
+        protected override async void OnLaunched(LaunchActivatedEventArgs args)
         {
             m_window = new MainWindow();
             var rootFrame = new Frame();