Write a C# Sharp program to create a new array from a given array of strings using all the strings whose length are matched with given string length

using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace exercises
{
   class Program
    {       
        static void Main(string[] args)
        {               
           ArrayList item = test(new[] {"a", "aaa", "b", "bbb", "c", "ccc" }, 3);            
           Console.Write("New array: ");         
           foreach(var i in item)
            {
               Console.Write(i.ToString()+" ");
            }     
        }                  
        static ArrayList test(string[] arr_str, int n)
         {
          ArrayList result_arra = new ArrayList();
            for (int i = 0; i < arr_str.Length; i++)
            {
                if (arr_str[i].Length == n)
                {
                    result_arra.Add(arr_str[i]);
                }
            }
            return result_arra;
        }    
    } 
}