ADO Net C# Tutorial

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.Data.SqlClient;
public class ListBoxFillFromDataReader : System.Windows.Forms.Form
{
    private System.Data.SqlClient.SqlConnection connection;
    private System.Data.DataSet dataSet;
    private System.Data.SqlClient.SqlCommand command;
    private System.Data.SqlClient.SqlDataAdapter dataAdapter;
    private System.Windows.Forms.ListBox lbBugs;
  private System.ComponentModel.Container components = null;
  public ListBoxFillFromDataReader()
  {
    InitializeComponent();
        string connectionString = "server=(local)\\SQLEXPRESS;database=MyDatabase;Integrated Security=SSPI;";
    using (connection = new System.Data.SqlClient.SqlConnection(connectionString))
    {
      connection.Open();
      using(dataSet = new System.Data.DataSet())
      {
        dataSet.CaseSensitive=true;
        string commandString = "Select ID, FirstName from Employee";
        command = new System.Data.SqlClient.SqlCommand();
        command.Connection=connection;
        command.CommandText= commandString;
        using (SqlDataReader dataReader = command.ExecuteReader())
        {
          while (dataReader.Read())
          {
            object bugID = dataReader["ID"];
            object description = dataReader["FirstName"];
            lbBugs.Items.Add(bugID.ToString() + ": " +  description.ToString());
          }
        }  
      }    
    }      
    }
  protected override void Dispose( bool disposing )
  {
    if( disposing )
    {
      if (components != null) 
      {
        components.Dispose();
      }
    }
    base.Dispose( disposing );
  }
  private void InitializeComponent()
  {
        this.lbBugs = new System.Windows.Forms.ListBox();
        this.SuspendLayout();
        this.lbBugs.Location = new System.Drawing.Point(16, 8);
        this.lbBugs.Name = "lbBugs";
        this.lbBugs.Size = new System.Drawing.Size(216, 147);
        this.lbBugs.TabIndex = 0;
        this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
        this.ClientSize = new System.Drawing.Size(264, 181);
        this.Controls.AddRange(new System.Windows.Forms.Control[] {
                                                                      this.lbBugs});
        this.Name = "ListBoxFillFromDataReader";
        this.Text = "ListBoxFillFromDataReader";
        this.ResumeLayout(false);
    }
  [STAThread]
  static void Main() 
  {
    Application.Run(new ListBoxFillFromDataReader());
  }
}