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Use Window Activated and Deactivated event to control a media file

<Window x:Class="CustomMediaPlayerWindow"     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"     Title="Custom Media Player"     Activated="window_Activated"     Deactivated="window_Deactivated"     Closing="window_Closing">   <DockPanel>     <Menu DockPanel.Dock="Top">       <MenuItem Header="_File">         <MenuItem Header="_Exit" Click="exitMenu_Click" />       </MenuItem>     </Menu>     <StackPanel DockPanel.Dock="Top" Orientation="Horizontal" HorizontalAlignment="Center">       <Button Name="playButton" Click="playButton_Click">Play</Button>       <Button Name="clickButton" Click="stopButton_Click">Stop</Button>     </StackPanel>     <MediaElement Stretch="Fill" Name="mediaElement" LoadedBehavior="Manual" Source="numbers.wmv" />   </DockPanel> </Window> //File:Window.xaml.cs using System; using System.ComponentModel; using System.Windows; public partial class CustomMediaPlayerWindow : Window {     public CustomMediaPlayerWindow()     {         InitializeComponent();     }     bool isMediaElementPlaying;          void playButton_Click(object sender, RoutedEventArgs e) {         this.mediaElement.Play();         this.isMediaElementPlaying = true;     }     void stopButton_Click(object sender, RoutedEventArgs e)     {         this.mediaElement.Stop();         this.isMediaElementPlaying = false;     }     void window_Activated(object sender, EventArgs e)     {         if( this.isMediaElementPlaying ) this.mediaElement.Play();     }     void window_Deactivated(object sender, EventArgs e)     {         if (this.isMediaElementPlaying) this.mediaElement.Pause();     }     void exitMenu_Click(object sender, RoutedEventArgs e)     {         this.Close();     }     void window_Closing(object sender, CancelEventArgs e)     {         if (this.isMediaElementPlaying)         {             e.Cancel = true;         }     } }