A quick tip on how to use custom fonts in a WPF application.
<Window.Resources>
<Style x:Key="MyCustomFont">
<Setter Property="TextElement.FontFamily" Value="fonts/#Arial Narrow Bold"/>
</Style>
</Window.Resources>
. . .
. . .
<TextBlock Style="{DynamicResource
MyCustomFont
}">Font Demo</TextBlock>
That's it. It's real easy!