Выполнять ряд действий, пока окно не закрыто. Как это сделать?

<Window x:Class="DoteOnScreen.MainWindow" x:Name="mw1"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:DoteOnScreen"
        mc:Ignorable="d"
        Title="MainWindow" WindowStartupLocation="CenterScreen" MouseLeave="Mouse_Live" MouseEnter="Mouse_Enter" Height="150" Width="150" VerticalAlignment="Bottom" Margin="0,0,0,0" AllowsTransparency="True" Background="Transparent" WindowStyle="None" ResizeMode="NoResize" Topmost="True">
 
    <Grid>
 
        <Border Width="Auto" Height="Auto" Name="windowFrame" 
 
        BorderBrush="#cc0000" 
        Background="#353ee5" 
        Opacity="0.20" 
 
        BorderThickness="1" 
        CornerRadius="5,5,0,0" Margin="0,0,0,0" Grid.ColumnSpan="2" >
        </Border>
        <TextBox x:Name="tb" HorizontalAlignment="Left" Height="23" Margin="14,62,0,0" TextWrapping="Wrap" VerticalAlignment="Top" Width="126"/>
 
 
    </Grid>
</Window>