controlmymonitormanagement/MonitorControl/App.xaml

<Application x:Class="MonitorControl.App"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:tb="clr-namespace:Hardcodet.Wpf.TaskbarNotification;assembly=Hardcodet.Wpf.TaskbarNotification.Net6"
             xmlns:local="clr-namespace:MonitorControl"
             Startup="Application_Startup">
    <Application.Resources>
        <tb:TaskbarIcon x:Key="TrayIcon"
                        IconSource="/MonitorIcon.ico"
                        ToolTipText="Monitor Control"/>
    </Application.Resources>
</Application>