Rotate the text 90 degrees using a RotateTransform
<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'>
<StackPanel Canvas.Left="0">
<TextBlock FontFamily="Arial Black" FontSize="64" Foreground="Moccasin" Margin ="80, 10, 0, 0">
Text Transforms
<TextBlock.RenderTransform>
<RotateTransform Angle="90" />
</TextBlock.RenderTransform>
</TextBlock>
</StackPanel>
</UserControl>
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