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Removing a Binding from a TextBox

<UserControl x:Class='SilverlightApplication3.MainPage'     xmlns='http://schemas.microsoft.com/winfx/2006/xaml/presentation'      xmlns:x='http://schemas.microsoft.com/winfx/2006/xaml'     xmlns:d='http://schemas.microsoft.com/expression/blend/2008'      xmlns:mc='http://schemas.openxmlformats.org/markup-compatibility/2006'      mc:Ignorable='d'      d:DesignWidth='640' d:DesignHeight='480'>     <StackPanel x:Name="LayoutRoot" Background="White" Orientation="Horizontal">         <TextBox x:Name="myTextBox" Text="{Binding TimeOfDay}" />                  <Button x:Name="myButton" Content="Break Binding" Click="myButton_Click" />              </StackPanel> </UserControl> //File: Page.xaml.cs using System; using System.Collections.Generic; using System.Linq; using System.Net; using System.Windows; using System.Windows.Data; using System.Windows.Controls; using System.Windows.Documents; using System.Windows.Input; using System.Windows.Media; using System.Windows.Media.Animation; using System.Windows.Shapes; namespace SilverlightApplication3 {     public partial class MainPage : UserControl     {         DateTime currentTime = DateTime.Now;                public MainPage()         {             InitializeComponent();             Binding binding = new Binding("TimeOfDay");             binding.Source = currentTime;             binding.Mode = BindingMode.OneWay;             myTextBox.SetBinding(TextBox.TextProperty, binding);                               }         private void myButton_Click(object sender, RoutedEventArgs e)         {             myTextBox.Text = "Binding Removed";         }     } }