using System;

using System.Linq;

public class Program

{

    public static void Main()

    {

        // Contains four values.

        int[] values1 = { 1, 2, 3, 4 };

​

        // Contains three values (1 and 2 also found in values1).

        int[] values2 = { 1, 2, 5 };

​

        // Remove all values2 from values1.

        var result = values1.Except(values2).Concat(values2.Except(values1));

​

        // Show

        foreach (var element in result)

        {

            Console.WriteLine(element);

        }       

​

    }

}