Rotate Text in WPF

<TextBlock

        Text="Some Text"

        Grid.Row="8"                                                              

        FontSize="9"                                                       

        Height="25"

        Width="auto"                                                                                                                              

        Grid.Column="2"

        VerticalAlignment="Bottom"

        TextAlignment="Center"

        Margin="5,0,-260,-35">

  <TextBlock.RenderTransform>

<TransformGroup>                                       

 <RotateTransform Angle="-90"/>

       </TransformGroup>                                          

 </TextBlock.RenderTransform>

</TextBlock>