Attached Property to set the HTML Source of a WebView control

WebClientHelper.cs

    public class WebClientHelper : DependencyObject
    {
        public static readonly DependencyProperty HtmlProperty =
            DependencyProperty.RegisterAttached("Html", typeof(string), typeof(WebClientHelper), new PropertyMetadata(null, HtmlChanged));

        public static void SetHtml(DependencyObject obj, string value)
        {
            obj.SetValue(HtmlProperty, value);
        }

        public static string GetHtml(DependencyObject obj)
        {
            return (string)obj.GetValue(HtmlProperty);
        }

        private static void HtmlChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            var webView = d as WebView;
            if (webView == null)
                return;
            webView.NavigateToString((string)e.NewValue);
        }

    }