using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Windows.Forms; using System.Data.SqlClient; namespace WindowsFormsApplication3 { public partial class Form1 : Form { public Form1() { InitializeComponent(); } private void Form1_Load(object sender, EventArgs e) { // List of cities we need to join List cities = new List(); cities.Add("Milano"); cities.Add("Roma"); cities.Add("Torino"); cities.Add("Napoli"); // Join strings into one CSV line string line = string.Join(",", cities.ToArray()); MessageBox.Show(line); } } }