How to create a dotted line in wpf for textbox?

Hi Team

I need to add dotted line on this textbox, does anyone know how to achieve this in wpf?

<TextBox x:Name="txtFullWeight" HorizontalAlignment="Left" Foreground="Black"  Height="26" Margin="587,266,0,0" TextWrapping="Wrap" VerticalAlignment="Top" Width="87" TextChanged="txtFullWeight_TextChanged" IsReadOnly="True"/>