C#

private DataRow[] SelectRows(string field, string[] values)
{
  if (field == null || values == null)
    throw new ArgumentNullException(field == null ? "field" : "values");
  if (values.Length < 1) throw new ArgumentException();
 
  StringBuilder sb = new StringBuilder();
  for (int i=0; i<values.Length; i++)
  {
    sb.AppendFormat("{0} = {1}", field, value);
    if (i < (values.Length - 1))
      sb.Append(" AND ");
    return dataTable1.Select(sb.ToString());
}

private void listView1_SelectedIndexChanged(object sender,
  EventArgs e)
{
  int index = listView1.SelectedIndex;
  if (index >= 0)
  {
    ListViewItem item = listView1.Items[index];
    // Get the second column of text.
    string value = item.SubItems[1]; // The first column is index 0.
    MessageBox.Show(value);
  }
}

private int GetColumnIndex()
{
  Point p = listView1.PointToClient(
    new Point(MousePosition.X, MousePosition.Y));
  int width = 0;
  foreach (ColumnHeader header in listView1.Columns)
  {
    width += header.Width;
    if (p.X < width) return header.Index;
  }
  return -1;
}