using System;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        // https://www.dotnetperls.com/list

        // 01) List of cities we need to join.

        List<string> cities = new List<string>();

        cities.Add("New York");

        cities.Add("Mumbai");

        cities.Add("Berlin");

        cities.Add("Istanbul");

​

        // Join strings into one CSV line.

        string line = string.Join(",", cities.ToArray());

        Console.WriteLine(line);

        Console.WriteLine();

        // Insert Sample

        List<string> dogs = new List<string>(); // Example list.

​

        dogs.Add("spaniel"); // Contains: spaniel.

        dogs.Add("beagle"); // Contains: spaniel, beagle.

        dogs.Insert(1, "dalmatian"); // Spaniel, dalmatian, beagle.

​

        foreach (string dog in dogs) // Display for verification.

        {

            Console.WriteLine(dog);

        }

        Console.WriteLine();

        // Reverse Sample

        List<string> list = new List<string>();

        list.Add("anchovy");

        list.Add("barracuda");

        list.Add("bass");

        list.Add("viperfish");

​

        // Reverse List in-place, no new variables required.

        list.Reverse();

​

        foreach (string value in list)

        {

            Console.WriteLine(value);

        }   

    }

}