using System;

using System.Collections.Generic;

using System.Linq;

​

public class Program

{

    public static IEnumerable<T> Merge<T>(T[] first, T[] second)

    {

        T[] merged = new T[(first.Length + second.Length)];

        for (int i = 0; i < merged.Length; i++)

            yield return (i < first.Length ?

                first[i] : second[i - first.Length]);

    }

​

    public static void Main()

    {

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

        int[] y = {5, 6, 7, 8};

        int[] z = Merge(x, y).ToArray();

        Array.ForEach<int>(z, (int e) =>

        {

            Console.WriteLine(e);

        });

    }

}