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(); }