ArrayList to Array of String to ArrayList

A few shortcut ways to convert ArrayList to Array of String, Array of String to ArrayList, or Join the string from ArrayList.

Here’s the code

using System;
using System.Collections;
using System.Collections.Generic;
using System.Text;

namespace ConsoleApplication1
{
    class Program
    {
        static void ArrayListToArrayOfStrings()
        {
            Console.WriteLine("ArrayList To Array Of Strings");

            ArrayList array_list = new ArrayList();
            array_list.Add("one");
            array_list.Add("two");
            array_list.Add("three");

            // THIS CONVERTS THE ARRAYLIST TO ARRAY OF STRINGS
            string[] array_of_strings = (string[])array_list.ToArray(typeof(string));

            foreach (string s in array_of_strings)
            {
                Console.WriteLine(s);
            }

            Console.ReadLine();
        }

        static void ArrayListToStringWithSeparator()
        {
            Console.WriteLine("Array List To String With Separator");

            ArrayList array_list = new ArrayList();
            array_list.Add("one");
            array_list.Add("two");
            array_list.Add("three");

            // THIS CONVERTS THE ARRAYLIST TO STRING AND JOIN IT WITH SEPRATOR "|" (PIPE)
            string str = string.Join("|", (string[])array_list.ToArray(typeof(string)));

            Console.WriteLine(str);
            Console.ReadLine();
        }

        static void ArrayOfStringsToArrayList()
        {
            Console.WriteLine("Array Of Strings To ArrayList");

            string[] array_of_strings = {
                                            "one", 
                                            "two", 
                                            "three"
                                        };

            // this can be done while instantiting a new ArrayList object
            ArrayList array_list = new ArrayList(array_of_strings);
            foreach (string s in array_list)
            {
                Console.WriteLine(s);
            }

            // or this
            array_list = new ArrayList();
            array_list.AddRange(array_of_strings);
            foreach (string s in array_list)
            {
                Console.WriteLine(s);
            }

            Console.ReadLine();
        }

        static void ArrayOfStringsWithSeparatorToArrayList()
        {
            Console.WriteLine("Array Of Strings With Separator To ArrayList");

            string str = "one|two|three";

            // this can be done while instantiting a new ArrayList object
            ArrayList array_list = new ArrayList(str.Split('|'));
            foreach (string s in array_list)
            {
                Console.WriteLine(s);
            }

            // or this
            array_list = new ArrayList();
            array_list.AddRange(str.Split('|'));
            foreach (string s in array_list)
            {
                Console.WriteLine(s);
            }

            Console.ReadLine();
        }

        static void Main(string[] args)
        {
            ArrayListToArrayOfStrings();
            ArrayListToStringWithSeparator();
            ArrayOfStringsToArrayList();
            ArrayOfStringsWithSeparatorToArrayList();
        }
    }
}