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by Jeff Handley via Jeff Handley on 5/26/2010 8:06:08 PM
Almost a year ago, I posted a lengthy article on how to implement Async Validation with RIA Services and DataForm. It was hard; much harder than it should have been, and we all knew it. Since then, things have changed, and async validation is a lot simpler. Let’s take a look at why it’s easier and how you can easily perform async validation in your application. INotifyDataErrorInfo Silverlight 4 shipped with an interface called INotifyDataErrorInfo, and controls that previously supported va
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