Applies to Silverlight 4, 5
Validation of your data before persisting it is a requirement for almost every application. By using validation on your Entities, you make sure that no invalid data is persisted to your data store. When you don't implement validation, there's a risk that a user will input wrongly formatted or plain incorrect data on the screen and even persist this data to your data store. This is something you should definitely avoid.
In this recipe, you'll learn how to validate data using data annotation attributes that you can use on your classes and properties.
Before getting started, you've got to make sure the correct SDK and assemblies to enable WCF RIA Services are available. ...