ListItem item = new ListItem();
                while (read.Read())
                {
                    item.Value = Convert.ToString(read["id"]);
                    item.Text = Convert.ToString(read["vcUserName"]);
                    ListBox1.Items.Add(item);
                }
                conn.Close();

  while (read.Read())
                {
                  ListBox1.Items.Add(new ListItem((string)read["vcUserName"], Convert.ToString(read["id"])));
                }
                conn.Close();