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BindingBase.TargetNullValue Property

Gets or sets the value that is used in the target when the value of the source is Nothing.

Namespace:  System.Windows.Data
Assembly:  PresentationFramework (in PresentationFramework.dll)
XMLNS for XAML: http://schemas.microsoft.com/winfx/2006/xaml/presentation, http://schemas.microsoft.com/netfx/2007/xaml/presentation

'Declaration
Public Property TargetNullValue As Object
<object TargetNullValue="nullValue" /><object>
  <object.TargetNullValue>
    nullValue
    </object.TargetNullValue>
</object>

XAML Values

nullValue

An attribute or object element value of the same type as the target property. See that type's documentation for XAML usage information. That type may or may not support attribute syntax for its values, or may or may not support object element syntax (which requires a default constructor on that type).

Property Value

Type: System.Object
The value that is used in the target when the value of the source is Nothing.

The following example binds a TextBox to a property of an object. If the property is Nothing, the TextBox displays "please enter a string."

<TextBox Width="150"
         Text="{Binding Source={StaticResource object2}, 
  Path=PropertyB, BindingGroupName=bindingGroup, 
  TargetNullValue=please enter a string}" />

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5 SP1, 3.0 SP2

.NET Framework Client Profile

Supported in: 4, 3.5 SP1
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