The relationship between the FontSize and LineHeight properties
<UserControl x:Class='SilverlightApplication3.MainPage'
xmlns='http://schemas.microsoft.com/winfx/2006/xaml/presentation'
xmlns:x='http://schemas.microsoft.com/winfx/2006/xaml'
xmlns:d='http://schemas.microsoft.com/expression/blend/2008'
xmlns:mc='http://schemas.openxmlformats.org/markup-compatibility/2006'
mc:Ignorable='d'
d:DesignWidth='640' d:DesignHeight='480'>
<Grid x:Name="LayoutRoot" Background="White" Margin="10">
<Canvas Height="450" Width="485">
<TextBlock Width="110" LineHeight="1" FontSize="14" TextWrapping="Wrap">
this is a test
</TextBlock>
<TextBlock Width="110" LineHeight="24" FontSize="14" TextWrapping="Wrap" Canvas.Left="125">
this is a test
</TextBlock>
<TextBlock Width="110" LineHeight="44" FontSize="14" TextWrapping="Wrap" Canvas.Left="250">
this is a test
</TextBlock>
</Canvas>
</Grid>
</UserControl>
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