Continue to get numbers until a certain string is entered?

Hello everyone. So, i'm just trying to make a simple console application so that anytime you enter a number, it'll enter it into the array, but when you enter "done" it will load & output all of the numbers that you entered. The problem is, I don't know how to continue to get the numbers, I can only get the first input. If you know what i'm talking about and how to fix this, please help.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Collections;

namespace ConsoleApplication2
{
    class Program
    {
        static public void Main ( ) {

            ArrayList numbers = new ArrayList();
            numbers = new ArrayList();

            Console.Title = "Numbers";
            Console.WriteLine ( "Enter in some numbers. When you're finished, type \"done\"");

            String text = Console.ReadLine();
            if (text.ToLower() != "done") {
                numbers.Add(Convert.ToInt32(text));
            } else {
                string numbs = "";
                for (int i = 0; i < numbers.Count; i++) {
                    if (i != 0){
                        numbs = numbs + ", " + numbers[i];
                    }else{
                        numbs = numbers[i] + "";
                    }
                }
                Console.WriteLine("You entered: " + numbs);
            }
            Console.ReadLine();
        }
    }
}

Thanks.

- Braydon