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BindingGroup.NotifyOnValidationError Property

Updated: July 2008

Gets or sets whether the Validation.Error event occurs when the state of a ValidationRule changes.

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

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

Property Value

Type: System.Boolean
true if the Validation.Error event occurs when the state of a ValidationRule changes; otherwise, false. The default is false.

The Validation.Error attached event occurs on the element that has the BindingGroup.

The following example creates a BindingGroup and sets NotifyOnValidationError to true so that the application can handle the Validation.Error event when a ValidationRule fails. For the entire example, see Validate the Data of an Object Sample.

  <BindingGroup NotifyOnValidationError="True">
      <src:ValidateDateAndPrice ValidationStep="ConvertedProposedValue" />

The following example handles the Validation.Error event.

// This event occurs when a ValidationRule in the BindingGroup 
// or in a Binding fails. 
private void ItemError(object sender, ValidationErrorEventArgs e)
    if (e.Action == ValidationErrorEventAction.Added)


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 SP1, 3.0 SP2




July 2008

Added topic for new class.

SP1 feature change.