Badge Notifications in windows application

In windows applications we see that there is some stuff of type integer 1, 2 or 3 or any thing on icon's bottom what is this????? These are called the badge notifications. How they works let learn

In the same project that we have made last time make a new button now this time you have to put the buttons in the stack panel

 <Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">

       <StackPanel>

        <Button Content="Tile button" Click="Button_Click"/>

        <Button Content="Badge Notifications" Click="Button_Click_1"/>

      </StackPanel>

    </Grid>

 Now open MainPage.xaml.cs and you will see that there is ans event for the button is generated write the following code in it 

private void Button_Click_1(object sender, RoutedEventArgs e)

        {

            var badgeNotification = BadgeUpdateManager.GetTemplateContent(BadgeTemplateType.BadgeNumber);

            XmlElement badge = (XmlElement)badgeNotification.SelectSingleNode("/badge");

            badge.SetAttribute("value", "20");

            BadgeNotification badgenoti = new BadgeNotification(badgeNotification);

            BadgeUpdateManager.CreateBadgeUpdaterForApplication().Update(badgenoti);

        }

run the application and you will click on the button and you will see the notification 20 written on the applications icon.

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