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Change the margins of an element that is within a Grid by XAML and programmatic code

<Window xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"     x:Class="WpfApplication1.Window1"     Title="Dynamically Change Margin Property Sample">   <DockPanel Background="White">     <TextBlock DockPanel.Dock="Top" FontSize="24" FontWeight="Bold">Grid Margin Property Sample</TextBlock>         <Border Border.Background="LightSteelBlue" Border.BorderThickness="2" Border.BorderBrush="Black" DockPanel.Dock="Top">             <Grid Name="grid1" Height="400">               <Grid.ColumnDefinitions>                 <ColumnDefinition/>               </Grid.ColumnDefinitions>               <Grid.RowDefinitions>                 <RowDefinition/>               </Grid.RowDefinitions>                 <TextBlock Name="text1" HorizontalAlignment="Center" Grid.Column="0" Grid.Row="0">Some Text.</TextBlock>           </Grid>         </Border>         <Grid HorizontalAlignment="Center" Width="300" DockPanel.Dock="Top">         <Grid.RowDefinitions>           <RowDefinition/>           <RowDefinition/>         </Grid.RowDefinitions>         <Grid.ColumnDefinitions>           <ColumnDefinition Width="Auto"/>           <ColumnDefinition Width="*"/>         </Grid.ColumnDefinitions>               <ListBox Grid.Row="0" Grid.Column="1" Width="50" Height="50" VerticalAlignment="Top" SelectionChanged="ChangeMargin">                   <ListBoxItem>10</ListBoxItem>                   <ListBoxItem>20</ListBoxItem>                   <ListBoxItem>30</ListBoxItem>                   <ListBoxItem>40</ListBoxItem>                   <ListBoxItem>50</ListBoxItem>                   <ListBoxItem>60</ListBoxItem>                   <ListBoxItem>70</ListBoxItem>                   <ListBoxItem>80</ListBoxItem>                   <ListBoxItem>90</ListBoxItem>                   <ListBoxItem>100</ListBoxItem>               </ListBox>           </Grid>       </DockPanel>         </Window> //File:Window.xaml.cs using System; using System.Windows; using System.Windows.Controls; using System.Windows.Documents; using System.Windows.Navigation; namespace WpfApplication1 {   public partial class Window1 : Window   {     public void ChangeMargin(object sender, SelectionChangedEventArgs args)     {       ListBoxItem li = ((sender as ListBox).SelectedItem as ListBoxItem);             ThicknessConverter myThicknessConverter = new ThicknessConverter();             Thickness th1 = (Thickness)myThicknessConverter.ConvertFromString(li.Content.ToString());             text1.Margin = th1;             String st1 = (String)myThicknessConverter.ConvertToString(text1.Margin);             Console.WriteLine("Margin: " + st1);     }   } }