int[] setA = new[] { 1, 2, 3, 4, 5 };
            int[] setB = new[] { 4, 5, 6, 7, 8 };

            var results = (from item in setA
                join item2 in setB on item equals item2
                select new
                {
                    Item1 = item,
                    Item2 = item2
                }).ToList();