public static void Test()
        {
            var A = new int[] {3, 4, 8, 10, 13};
            var B = new int[] {1, 2, 8, 10, 18 };
            var interSections = FindIntersection(A, B);
            //Int32[] intValues = (Int32[])interSections.ToArray(typeof(Int32));
            Int32[] intValues = new Int32[interSections.Count];
            interSections.CopyTo(intValues);

            Console.WriteLine(interSections.ToArray());
            Console.WriteLine(intValues);

            Console.WriteLine(string.Concat(interSections.Select(p=>p+ " "))); //using System.Linq;
            Console.WriteLine(string.Concat(intValues.ToArray())); //using System.Linq;

            foreach (var c in interSections)
            {
                Console.WriteLine(c);
            }

            Console.ReadKey();
        }