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Therefore they can be accessed and styled in the 'standard' way, for example: See the excellent article Validation in WPF for details.
However, Binding Groups offer one further advantage, validation errors from the associated binding expressions are also placed in the Validation. Personally, I don't think there is one best approach - and this blog post is certainly not an attack on Sacha's article, which presents an elegant solution.
A collection of validation failures are associated with the view model.
These can either be rendered in their entirety or each control within the view can render errors relating to their context.
Errors attached property of the element which the Binding Group is associated with.Over the weekend Sacha published a new article on codeproject, Total View Validation (does Sacha ever sleep? This article addresses some of the perceived problems with the WPF binding framework, firstly, that the standard solution of using the Validates On Data Errors property forces you to place validation logic into your bound business objects, and secondly, that there is no way to perform validation across multiple objects.His solution to both these problems was to construct a view model which contains the validation rules and applies them to all the objects within the form.In this post I will take the application from Sacha's article and modify it to use Binding Groups.The following is a screenshot of the application: The form displays the details of two People (two instances of the Person class).
similarly if the user changes the value to a acceptable one I switch Error Provider OFF for that Control..