This is a simple WPF sample that makes validation based on Annotations.

WPF makes a good job of providing data binding between business objets/Viewmodel Plain Old C# Objects

There are many ways to validate in WPF : ValidationRules usable in XAML, IDataErrorInfo, ....

The ValidatorBase class provided in the sample helps providing errors to the Graphical User Interface based upon Data Annotations

Just make the inheritance relation and add the attributes !

For instance :

    public class Contact : ValidatorBase
    {
      [Required(ErrorMessage = " Name is required.")]
      [StringLength(50, ErrorMessage = "No more than 50 characters")]
      [Display(Name = "Name")]
      public string Name { get; set; }
	}