Validate input in Xamarin.Forms using INotifyDataErrorInfo, custom Behaviors, Effects and Prism

In this post, Senior Application Development Manager, Davide Zordan, explores the rich set of validation features in Xamarin.Forms. I have recently been investigating the support available in Xamarin.Forms for validation and, in particular, researched the possibility of using INotifyDataErrorInfo to complement the traditional approach of using Behaviors.