using System;

using System.Collections.Generic;

using System.Linq;

​

public class Program

{

    public static void Main()

    {

        //LINQ union Method

        string[] count1 = { "UK", "Australia", "India", "USA" };

        string[] count2 = { "India", "Canada", "UK", "China" };

        /* var result = count1.Count();

        Console.WriteLine(result); */

        var result = count1.Union(count2).ToArray();

        for(var i = 0; i < result.Length; i++){

            Console.WriteLine(result[i]); 

        }

        //with foreach simple way

        Console.WriteLine("\n*************************\n");

        var result2 = count1.Union(count2);

        foreach(var item in result2)

        {

            Console.WriteLine(item);

        }

    }

}