/// <summary>
    /// Compare!
    /// </summary>
    /// <param name="x"></param>
    /// <param name="y"></param>
    /// <returns></returns>
    public override int Compare(object x, object y)
    {
 

      string x1 = null;

      if (col < ((ListViewItem)x).SubItems.Count)
          x1 = ((ListViewItem)x).SubItems[col].Text;

      string y1 = null;

        if(col <  ((ListViewItem)y).SubItems.Count)
            y1 = ((ListViewItem)y).SubItems[col].Text;
 
      if (comparer == null)
      {
        // Default is the StringComparer
        ISortComparer c = new StringComparer();
        c.SortOrder = sortorder;
        return c.Compare(x1, y1);
      }
      else
      {
        comparer.SortOrder = sortorder;
        return comparer.Compare(x1, y1);
      }
    }