Get Parent Window WPF

public static Window GetParentWindow(DependencyObject child)
        {
            DependencyObject parentObject = VisualTreeHelper.GetParent(child);
            if (parentObject == null)
            {
                return null;
            }

            Window parent = parentObject as Window;
            if (parent != null)
            {
                return parent;
            }
            else
            {
                return GetParentWindow(parentObject);
            }
        }