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8 changes: 4 additions & 4 deletions docs/framework/wpf/data/how-to-implement-validation-logic-on-custom-objects.md
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---
title: "How to: Implement Validation Logic on Custom Objects"
ms.date: "03/30/2017"
ms.date: "08/02/2018"
dev_langs:
- "csharp"
- "vb"
Expand All @@ -15,14 +15,14 @@ ms.assetid: 751fda9b-44f9-4d63-b4f2-1df07ac41e0f
This example shows how to implement validation logic on a custom object and then bind to it.

## Example
You can provide validation logic on the business layer if your source object implements <xref:System.ComponentModel.IDataErrorInfo>, as in the following example:
You can provide validation logic on the business layer if your source object implements <xref:System.ComponentModel.IDataErrorInfo>, as in the following example, which defines a `Person` object that implements <xref:System.ComponentModel.IDataErrorInfo>:

[!code-csharp[BusinessLayerValidation#IDataErrorInfo](../../../../samples/snippets/csharp/VS_Snippets_Wpf/BusinessLayerValidation/CSharp/Data.cs#idataerrorinfo)]
[!code-vb[BusinessLayerValidation#IDataErrorInfo](../../../../samples/snippets/visualbasic/VS_Snippets_Wpf/BusinessLayerValidation/VisualBasic/Data.vb#idataerrorinfo)]

In the following example, the text property of the text box binds to the `Age` property of the `Person` object, which has been made available for binding through a resource declaration that is given the `x:Key` `data`. The <xref:System.Windows.Controls.DataErrorValidationRule> checks for the validation errors raised by the <xref:System.ComponentModel.IDataErrorInfo> implementation.
In the following example, the text property of the text box binds to the `Person.Age` property, which has been made available for binding through a resource declaration that is given the `x:Key` `data`. The <xref:System.Windows.Controls.DataErrorValidationRule> checks for the validation errors raised by the <xref:System.ComponentModel.IDataErrorInfo> implementation.

[!code-xaml[BusinessLayerValidation#BoundTextBox](../../../../samples/snippets/csharp/VS_Snippets_Wpf/BusinessLayerValidation/CSharp/Window1.xaml#boundtextbox)]
[!code-xaml[BusinessLayerValidation#BoundTextBox](../../../../samples/snippets/csharp/VS_Snippets_Wpf/BusinessLayerValidation/CSharp/Window1.xaml?highlight=8,11-19,25-42)]

Alternatively, instead of using the <xref:System.Windows.Controls.DataErrorValidationRule>, you can set the <xref:System.Windows.Data.Binding.ValidatesOnDataErrors%2A> property to `true`.

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