Properties of a TextBlock not working when the Xaml is loaded in during runtime.

I need the textblock to have the TextAlignment as "Right".

Xaml:

<StackPanel
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"><TextBlock FontSize="50" Background="White"/><ListView  Grid.Row="2" BorderBrush="White"
Name="ListView1"
ItemsSource="{Binding Path=Line}"
                   HorizontalAlignment="Stretch"
FontSize="23"><ListView.ItemTemplate><DataTemplate><StackPanel><TextBlock TextAlignment="Right" Text= "{Binding Path = aline}"/></StackPanel> </DataTemplate></ListView.ItemTemplate></ListView ></StackPanel>