/// <summary>
 /// The clearCopies method will clear the copies contained within a transaction object. It will
 /// reset the availability of the copies back to true, before clearing the lists.
 /// </summary>
 /// <param name="transaction">The transaction object</param>
 private void clearCopies(Transaction transaction)
 {
     if (transaction.transactionID > 0)
     {
         TransactionItem.UpdateCopyStatus(transaction.transactionID, DVDCopy.Status.AVAILABLE);
         TransactionItem.Clear(transaction.transactionID);
     }
 }