C#

class ListViewSortering : IComparer
{
   private int colStart;
   private int colEnd;

   public ListViewSortering()
   {
      colStart=0;
      colEnd=0;
   }

   public ListViewSortering(int columnStart, int columnEnd)
   {
      colStart=columnStart;
      colEnd=columnEnd;
   }

   public int Compare(object x, object y)
   {
      ListViewItem lvi1 = (ListViewItem)x;
      ListViewItem lvi2 = (ListViewItem)y;

      string start1 = lvi1.SubItems[colStart].Text;
      string end1 = lvi1.SubItems[colEnd].Text;
      string start2 = lvi2.SubItems[colStart].Text;
      string end2 = lvi2.SubItems[colEnd].Text;

      if (end1.Length == 0 && end2.Length > 0)
         return -1;
      if (end1.Length > 0 && end.Length == 0)
         return 1;

      return -String.Compare(start1, start2);
   }
}