ValidationAdornerSite Attached Property

Validation.ValidationAdornerSite Attached Property


Gets or sets the element that appears to indicate that a validation error occurred on the bound element where this property is set.

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

See GetValidationAdornerSite, SetValidationAdornerSite

Property Value

Type: System.Windows.DependencyObject

The element that appears to indicate that a validation error occurred on the bound element.

The Validation.ValidationAdornerSite and Validation.ValidationAdornerSiteFor attached properties reference each other, and you can set either one. For example, suppose that a Label displays validation errors that occur on a data-bound TextBox. You can do one of the following to establish that relationship:

Identifier field


Metadata properties set to true


The following example uses a Label as the adorner site for the validation errors that occur on items in an ItemsControl. The example sets the Validation.ValidationAdornerSite for each item container in the ItemContainerStyle to the label. The example uses the Validation.ValidationAdornerSiteFor property to get the item container that has the error and binds the Content of the Label to the first ValidationError that is reported.

<ItemsControl Name="customerList"  ItemTemplate="{StaticResource ItemTemplate}"
    <Style TargetType="{x:Type ContentPresenter}">
      <Setter Property="Validation.ValidationAdornerSite"
              Value="{Binding ElementName=validationErrorReport}"/>
<Label Name="validationErrorReport" 
       Content="{Binding RelativeSource={RelativeSource Self}, 
       Margin="5" Foreground="Red" HorizontalAlignment="Center"/>
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