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The method returns true or false depending on whether the validation succeeded or not and it also returns a collection of error messages as an out parameter.Declaring an argument as out is useful when you want the method to return multiple values.
You can do this by implementing a custom validation rule and associate this with the object at any given step, any errors that were added to the Validation.
A common requirement for any user interface application that accepts user input is to validate the entered information to ensure that it has the expected format and type for the back-end to be able to accept and persist it.
This post is about how data validation works in WPF and the different validation options there are available including implementing custom Validation Rules and using the In a typical WPF application that uses the MVVM (Model-View-View Model) design pattern, a dependency property of a user interface control in a XAML-defined view uses data binding to bind to some data returned by a CLR property of the view model.
Error Template will be displayed on the adorner layer.
Elements in the adorner layer are rendered on top of the rest of the visual elements and they will not be considered when the layout system is measuring and arranging the controls on the adorned element layer.
The adorned element in this case is the Text Box control itself and you include an in the control template where you want to leave space for it.