using System;
using System.Collections.Generic;
public class Program
{
public static void Main() {
var list = new List<string>() { "c#", "vb.net", "java", "c", "c++" };
string CSVline = string.Join(",", list.ToArray());
Console.WriteLine(CSVline);
}
}
/*
run:
c#,vb.net,java,c,c++
*/