wpf-notifyicon/Source/Sample Project/Tutorials/01 - Declaration/SimpleWindowWithNotifyIcon.xaml

<Window
    x:Class="Samples.Tutorials.SimpleWindowWithNotifyIcon"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:tb="http://www.hardcodet.net/taskbar"
    Height="300"
    Width="300">
    <Grid>

        <!-- in order to declare a NotifyIcon, all you need is the namespace declaration (see above on line 5) and a single line -->
        <tb:TaskbarIcon x:Name="MyNotifyIcon" IconSource="/Icons/Error.ico" ToolTipText="hello world" />

        <TextBlock Margin="26,26,24,0"
                   VerticalAlignment="Top"
                   FontWeight="Bold"
                   TextWrapping="Wrap"
                   Text="You should see an icon in the tray." />

    </Grid>
</Window>