class Example
    {
        public string X { get; set; }
        public string Y { get; set; }
        public string W { get; set; }
        public string H { get; set; }
        public string A { get; set; }
    }

IEnumerable<Example> exampleCollection

exampleCollection = exampleCollection.OrderBy(e => e.Y).ThenBy(e => e.A);