Visual Basic 2015 Unleashed

Validating Data

Data validation involves decorating entities and their properties with some attributes from the System.ComponentModel.DataAnnotations and System.ComponentModel.DataAnnotations.Schema namespaces (from the System.ComponentModel.DataAnnotations.dll assembly). Each attribute provides additional information or validation rules to types. This is not new: if you have developed Silverlight applications with WCF RIA Services in the past, you used data annotations frequently. The following code demonstrates how to add some validation rules to the Product entity using data annotations:

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Imports System.ComponentModel.DataAnnotationsPartial Public Class Product    Public Property ProductID As Integer    'The product ...