How do I correctly use .NET Data Annotations to validate data in WPF using the WCF backend?

The title of the question pretty much explains what I am trying to do.

Simplifying my code like:

WCF Service Sample Bits:

    pulic class Restaurant
    {
         //RegEx to only allow alpha characters with a max length of 40
         //Pardon if my regex is slightly off
         [RegularExpression(@"^[a-zA-Z''-'\s]{1,40}$")]
         public string Name { get; set; }
    }

    public class RestaurantService
    {
         List<Restaurant> restaurants = new List<Restaurant>();

         public AddRestaurant(string name)
         {
              Restaurant restaurant = new Restaurant();
              restaurant.Name = name;
              restaurants.Add(restaurant);
         }
    }

      

        
        
        
      

    

XAML example bits:

    <TextBox name="txt1" Text="{Binding Restaurant.Name, ValidatesOnDataErrors=True}"/>

      

        
        
        
      

    

How do I make my view something when the annotation of my information is broken?

All the examples I can find here and elsewhere are either not exactly what I'm looking for or that are related to ASP.NET. I don't know enough about WPF and Data Annotations and I am very green with WCF.

I tried to implement the IDataErrorInfo interface, but I can't get it to trigger anything. I found this code in another question on StackOverflow. I have implemented this in my Restaurant class in a WCF service.

    public string this[string columnName]
    {
        get 
        {
            if (columnName == "Name")
            {
                return ValidateProperty(this.Name, columnName);
            }
            return null;
        }
    }

    protected string ValidateProperty(object value, string propertyName)
    {
        var info = this.GetType().GetProperty(propertyName);
        IEnumerable<string> errorInfos =
              (from va in info.GetCustomAttributes(true).OfType<ValidationAttribute>()
               where !va.IsValid(value)
               select va.FormatErrorMessage(string.Empty)).ToList();

        if (errorInfos.Count() > 0)
        {
            return errorInfos.FirstOrDefault<string>();
        }
        return null;
    }