NotifyOnValidationError Property
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BindingGroup.NotifyOnValidationError Property

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.

  <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)


.NET Framework

Supported in: 4, 3.5 SP1, 3.0 SP2

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

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

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