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">
            <Run Text="You should see an icon in the tray." Language="de-ch" />
        </TextBlock>

    </Grid>
</Window>