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Programmatically change the FontFamily property of a TextBlock element

<Window xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"     x:Class="FontSizeConverter_Csharp.Window1"     Title="FontSizeConverter Sample"> <StackPanel>         <TextBlock Name="text1" TextWrapping="Wrap" Height="300" Width="500">             this is a test         </TextBlock>     <ListBox Grid.Column="1" Grid.Row="1" VerticalAlignment="Top" Height="50" Margin="10,0,0,0" SelectionChanged="changeSize">         <ListBoxItem>5</ListBoxItem>         <ListBoxItem>8</ListBoxItem>         <ListBoxItem>11</ListBoxItem>         <ListBoxItem>14</ListBoxItem>         <ListBoxItem>17</ListBoxItem>         <ListBoxItem>20</ListBoxItem>         <ListBoxItem>23</ListBoxItem>         <ListBoxItem>26</ListBoxItem>         <ListBoxItem>29</ListBoxItem>         <ListBoxItem>32</ListBoxItem>     </ListBox>     <ListBox Grid.Column="3" Grid.Row="1" VerticalAlignment="Top" Height="50" Margin="10,0,0,0" SelectionChanged="changeFamily">       <ListBoxItem>Arial</ListBoxItem>       <ListBoxItem>Courier New</ListBoxItem>       <ListBoxItem>Tahoma</ListBoxItem>       <ListBoxItem>Times New Roman</ListBoxItem>       <ListBoxItem>Verdana</ListBoxItem>     </ListBox>             </StackPanel>         </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 FontSizeConverter_Csharp {   public partial class Window1 : Window   {         public void changeSize(object sender, SelectionChangedEventArgs args)         {       ListBoxItem li = ((sender as ListBox).SelectedItem as ListBoxItem);       FontSizeConverter myFontSizeConverter = new FontSizeConverter();       text1.FontSize = (Double)myFontSizeConverter.ConvertFromString(li.Content.ToString());         }     public void changeFamily(object sender, SelectionChangedEventArgs args)     {       ListBoxItem li2 = ((sender as ListBox).SelectedItem as ListBoxItem);             text1.FontFamily = new System.Windows.Media.FontFamily(li2.Content.ToString());         }   } }