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copied!<p>Most probably you're trying to bind to a .net CLR property instead of a WPF dependencyProperty (which provides Change Notification in addition to some other things).<br> For normal CLR property, you'd need to implement INotifyPropertyChanged and force update on the textbox in the event handler for PropertyChanged. </p> <ul> <li>So make your object with the property implement this interface, raise the event in the property setter. (So now we have property change notification)</li> <li>Make sure the object is set as the DataContext property of the UI element/control</li> </ul> <p>This threw me off too when I started learning about WPF data binding.</p> <p><strong>Update:</strong> <em>Well OP, it would have been a waste of time if i was barking up the wrong tree.. anyways now since you had to dig a bit.. you'll remember it for a long time.</em> Here's the code snippet to round off this answer. Also found that updating the textbox happens automatically as soon as I tab-out.. You only need to manually subscribe to the event and update the UI if your datacontext object is not the one implementing INotifyPropertyChanged.</p> <p>MyWindow.xaml</p> <pre><code><Window x:Class="DataBinding.MyWindow" ... Title="MyWindow" Height="300" Width="300"> <StackPanel x:Name="TopLevelContainer"> <TextBox x:Name="txtValue" Background="AliceBlue" Text="{Binding Path=MyDotNetProperty}" /> <TextBlock TextWrapping="Wrap">We're twin blue boxes bound to the same property.</TextBlock> <TextBox x:Name="txtValue2" Background="AliceBlue" Text="{Binding Path=MyDotNetProperty}" /> </StackPanel> </Window> </code></pre> <p>MyWindow.xaml.cs</p> <pre><code>public partial class MyWindow : Window, INotifyPropertyChanged { public MyWindow() { InitializeComponent(); this.MyDotNetProperty = "Go ahead. Change my value."; TopLevelContainer.DataContext = this; } private string m_sValue; public string MyDotNetProperty { get { return m_sValue; } set { m_sValue = value; if (null != this.PropertyChanged) { PropertyChanged(this, new PropertyChangedEventArgs("MyDotNetProperty")); } } } #region INotifyPropertyChanged Members public event PropertyChangedEventHandler PropertyChanged; #endregion } </code></pre>

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