How to join two Arrays in C#

A simple console application in which you can get how to join 2 arrays in C#. In this demo we have implemented multiple way to merge arrays.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
 
namespace ArrayJoinDemo
{
    class Program
    {
        static void Main(string[] args)
        {
 
            int[] array1 = new int[] { 2, 1, 3 };
            int[] array2 = new int[] { 5, 4, 6 };
            Console.WriteLine("-----Method : 1--------------------");
            var join1 = array1.Union(array2).ToArray();
            Console.WriteLine(string.Join(",", join1));
 
            Console.WriteLine("-----Method : 2--------------------");
            var join2 = array1.Concat(array2).ToArray();
            Console.WriteLine(string.Join(",", join2));
 
            Console.WriteLine("-----Method : 3--------------------");
            int[] join3 = new int[array1.Length + array2.Length];
            Array.Copy(array1, join3, array1.Length);
            Array.Copy(array2, 0, join3, array1.Length, array2.Length);
            Console.WriteLine(string.Join(",", join3));
 
            Console.WriteLine("-----Method : 4--------------------");
            int[] join4 = new int[array1.Length + array2.Length];
            Buffer.BlockCopy(array1, 0, join4, 0, array1.Length * sizeof(int));
            Buffer.BlockCopy(array2, 0, join4, array1.Length * sizeof(int), array2.Length * sizeof(int));
            Console.WriteLine(string.Join(",", join4));
 
            Console.WriteLine("-----Method : 5--------------------");
            int[] join5 = new int[array1.Length + array2.Length];
            for (int i = 0; i < array1.Length; i++)
            {
                join5[i] = array1[i];
            }
            for (int i = 0; i < array2.Length; i++)
            {
                join5[array1.Length + i] = array2[i];
            }
            Console.WriteLine(string.Join(",", join5));
 
 
            Console.Read();
        }
    }
}

Output: