public static class Utilities    {        public static bool IsInLandscape(this PhoneApplicationPage page)        {            return !page.IsInPortrait();        }        public static bool IsInPortrait(this PhoneApplicationPage page)        {            return page.IsInOrientation(PageOrientation.Portrait |                PageOrientation.PortraitUp | PageOrientation.PortraitDown);        }        public static bool IsInOrientation(this PhoneApplicationPage page, PageOrientation testOrientation)        {            var orientation = page.Orientation;            return orientation.IsOrientation(testOrientation);        }        public static bool IsOrientation(this PageOrientation orientation, PageOrientation testOrientation)        {            return (orientation & testOrientation) > 0;        }    }