public void TableSelectionChanged(ArrayList Rows)
 {
     if (Rows.Count == 0)
     {
         SelectedKey = null;
     }
     else
     {
         SelectedKey = (UpdateSigningKey)keys[(int)Rows[0]];
     }
 }
        public void TableSelectionChanged(ArrayList Rows) {

            if (Rows.Count == 0) {
                SelectedKey = null;
            } else {
                SelectedKey = (UpdateSigningKey)keys[(int)Rows[0]];
            }
        }