C#

Set the listbox's DisplayMember and ValueMember properties to the name of the fields in the DataTable (if using a DataSet prefix them with the name of the table), then set the DataSource property to the instance of the DataSet or DataTable.

public class MyData
{
  private int id;
  public string theField;
  // More data members 
 
  public MyData(int id, string theField)
  {
    this.id = id;
    this.theField = theField;
  }
  // More Constructors
 
  public int ID
  {
    get { return id; }
  }
 
  public string TheField
  {
    get { return theField; }
    set { theField = value; }
  }
}

MyData [] data = new MyData[3];
data[0] = new MyData(0, "Huey");
data[1] = new MyData(1, "Dewy");
data[2] = new MyData(2, "Louie");
 
myListBox.DisplayMember = "TheField";
myListBox.ValueMember = "ID";
myListBox.DataSource = data;

using System;
using System.Net;
using System.Text;

namespace Utilities
{
    class WebPage
    {
        static string GetHtml(string address)
        {
            WebClient client = new WebClient();
            return Encoding.Default.GetString(client.DownloadData(address));
        }
    }
}

private MainForm()
{
}

static MainForm instMainForm=new MainForm();

public static MainForm TheForm {
    get {
        return instMainForm;
    }
}