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Binding.NotifyOnTargetUpdated Property

Gets or sets a value that indicates whether to raise the TargetUpdated event when a value is transferred from the binding source to the binding target.

Namespace:  System.Windows.Data
Assembly:  PresentationFramework (in PresentationFramework.dll)

public bool NotifyOnTargetUpdated { get; set; }
<object NotifyOnTargetUpdated="bool" .../>

Property Value

Type: System.Boolean
true if the TargetUpdated event should be raised when the binding target value is updated; otherwise, false. The default is false.

This example shows how to set up to be notified when the binding target (target) or the binding source (source) property of a binding has been updated.

Windows Presentation Foundation (WPF) raises a data update event each time that the binding source or target has been updated. Internally, this event is used to inform the user interface (UI) that it should update, because the bound data has changed. Note that for these events to work, and also for one-way or two-way binding to work properly, you need to implement your data class using the INotifyPropertyChanged interface. For more information, see How to: Implement Property Change Notification.

Set the NotifyOnTargetUpdated or NotifyOnSourceUpdated property (or both) to true in the binding. The handler you provide to listen for this event must be attached directly to the element where you want to be informed of changes, or to the overall data context if you want to be aware that anything in the context has changed.

For the complete sample, see Controlling the Direction and Timing of the Data Flow Sample.

Here is an example that shows how to set up for notification when a target property has been updated.

<TextBlock Grid.Row="1" Grid.Column="1" Name="RentText"
  Text="{Binding Path=Rent, Mode=OneWay, NotifyOnTargetUpdated=True}"

You can then assign a handler based on the EventHandler<T> delegate, OnTargetUpdated in this example, to handle the event:

private void OnTargetUpdated(Object sender, DataTransferEventArgs args)

  // Handle event



Parameters of the event can be used to determine details about the property that changed (such as the type or the specific element if the same handler is attached to more than one element), which can be useful if there are multiple bound properties on a single element.

Windows 7, Windows Vista, Windows XP SP2, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.5, 3.0