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Convert contents of a ListBoxItem to an instance of Thickness by using the ThicknessConverter

<Window xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"     x:Class="ThicknessConverter_Csharp.Window1"     Title="ThicknessConverter Sample">   <DockPanel Width="400" HorizontalAlignment="Left" VerticalAlignment="Top">     <TextBlock DockPanel.Dock="Top" FontFamily="Verdana" FontSize="18" FontWeight="Bold" Margin="5">       ThicknessConverter Sample</TextBlock>     <Border Name="border1" Height="300" Width="300" Border.BorderThickness="2" Border.BorderBrush="Black" DockPanel.Dock="Top">       <Grid Height="30" VerticalAlignment="Top">         <Grid.RowDefinitions>           <RowDefinition/>           <RowDefinition/>         </Grid.RowDefinitions>         <TextBlock Grid.Row="0" Name="bThickness"/>         <TextBlock Grid.Row="1" Name="bColor"/>       </Grid>     </Border>     <Grid DockPanel.Dock="Top">       <Grid.RowDefinitions>         <RowDefinition/>         <RowDefinition/>         <RowDefinition/>       </Grid.RowDefinitions>       <Grid.ColumnDefinitions>         <ColumnDefinition/>         <ColumnDefinition/>         <ColumnDefinition/>         <ColumnDefinition/>       </Grid.ColumnDefinitions>       <TextBlock Grid.Row="1" Grid.Column="0" Margin="10,0,0,0" TextWrapping="Wrap">Change the BorderThickness Property:</TextBlock>       <ListBox VerticalAlignment="Top" Grid.Column="1" Grid.Row="1" Width="50" Height="50" Margin="5" SelectionChanged="changeThickness">         <ListBoxItem>0</ListBoxItem>         <ListBoxItem>5</ListBoxItem>         <ListBoxItem>10</ListBoxItem>         <ListBoxItem>15</ListBoxItem>         <ListBoxItem>20</ListBoxItem>         <ListBoxItem>25</ListBoxItem>         <ListBoxItem>30</ListBoxItem>         <ListBoxItem>35</ListBoxItem>         <ListBoxItem>40</ListBoxItem>         <ListBoxItem>45</ListBoxItem>         <ListBoxItem>50</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; using System.Windows.Media; namespace ThicknessConverter_Csharp {   public partial class Window1 : Window   {         public void changeThickness(object sender, SelectionChangedEventArgs args)         {       ListBoxItem li = ((sender as ListBox).SelectedItem as ListBoxItem);       ThicknessConverter myThicknessConverter = new ThicknessConverter();       Thickness th1 = (Thickness)myThicknessConverter.ConvertFromString(li.Content.ToString());             border1.BorderThickness = th1;             bThickness.Text = "Border.BorderThickness =" + li.Content.ToString();         }   } }