How to add validation to view model properties or how to implement INotifyDataErrorInfo
The preferred way since .Net 4.5 to implement data validation is to let your view model implement INotifyDataErrorInfo (example from Technet, example from MSDN (Silverlight)). Note: INotifyDataErrorInfo replaces the obsolete IDataErrorInfo. The new framework infrastructure related to the INotifyDataErrorInfo interface provides many advantages like support of multiple errors per property custom error objects and customization … Read more