using System;

using System.Linq;  

using System.Collections.Generic;

​

public class Program

{

    public static void Main()

    {

        var arr1 = new dynamic[]{12,3,4,5};

        var arr2 = new dynamic[]{1,2,4,6};

        Console.WriteLine("arr1 except arr2");

        Except(arr1,arr2).ForEach(x=> Console.WriteLine(x));

        Console.WriteLine("\narr1 except arr2 + arr2 except arr1");

        ExceptAll(arr1,arr2).ForEach(x=> Console.WriteLine(x));

    }

    public static List<dynamic> Except(dynamic[] array1, dynamic[] array2){

        return array1.Except(array2).ToList();

    }

    public static List<dynamic> ExceptAll(dynamic[] array1, dynamic[] array2){

        return array1.Except(array2).Union(array2.Except(array1)).ToList();

    }

}