binding mode, trigger

PacticeSolution/DataBindingSample/MainWindow.xaml

@@ -9,9 +9,9 @@
     <StackPanel>
         <Label HorizontalAlignment="Center">--- By XAML Code ---</Label>
         <TextBox x:Name="tbxByXaml" VerticalAlignment="Center"/>
-        <Label x:Name="lblByXaml" Height="30" VerticalAlignment="Center" Content="{Binding ElementName=tbxByXaml, Path=Text}"/>
+        <TextBox x:Name="tbxByXaml2" Height="30" VerticalAlignment="Center" Text="{Binding ElementName=tbxByXaml, Path=Text, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"/>
         <Label HorizontalAlignment="Center">--- By Code Behind ---</Label>
         <TextBox x:Name="tbxByCodeBehind"/>
-        <Label x:Name="lblByCodeBehind" Height="30" VerticalAlignment="Center"/>
+        <TextBox x:Name="tbxByCodeBehind2" Height="30" VerticalAlignment="Center"/>
     </StackPanel>
 </Window>

PacticeSolution/DataBindingSample/MainWindow.xaml.cs

@@ -31,7 +31,9 @@ namespace DataBindingSample
             Binding binding = new Binding();
             binding.Source = tbxByCodeBehind;
             binding.Path = new PropertyPath(TextBox.TextProperty);
-            lblByCodeBehind.SetBinding(Label.ContentProperty, binding);
+            binding.Mode = BindingMode.TwoWay;
+            binding.UpdateSourceTrigger = UpdateSourceTrigger.PropertyChanged;
+            tbxByCodeBehind2.SetBinding(TextBox.TextProperty, binding);
         }
     }
 }