Jack @ ASP.NET

=== Program that converts List (C#) ===

using System;
using System.Collections.Generic;

class Program
{
    static void Main()
    {
        List<string> dogs = new List<string>(); // Create new list of strings
        dogs.Add("Aigi");                       // Add string 1
        dogs.Add("Spitz");                      // 2
        dogs.Add("Mastiff");                    // 3
        dogs.Add("Finnish Spitz");              // 4
        dogs.Add("Briard");                     // 5

        string dogCsv = string.Join(",", dogs.ToArray());
        Console.WriteLine(dogCsv);
    }
}

=== Output of the program ===

Aigi,Spitz,Mastiff,Finnish Spitz,Briard