/// <summary>
/// Completes a given file transfer - invoking this operation
/// closes and removes the transfer from the service. It is highly
/// recommended to invoke this method after finishing a transfer
/// in order to free used/locked resources as soon as possible.<br/>
/// In case of an upload, setting the <see cref="DataBlockInfo.IsLastBlock"/>
/// property of the last submitted data block implicitly calls this method.
/// </summary>
/// <param name="transferId">Identifies the transfer and resource.</param>
/// <returns>The new status of the transfer, which is <see cref="TransferStatus.Completed"/>
/// in case of a known transfer. If the transfer is not known (maybe because it was aborted
/// by the system), this method returns <see cref="TransferStatus.UnknownTransfer"/>.</returns>
/// <exception cref="UnknownTransferException">In case the <paramref name="transferId"/>
/// does not refer to an active transfer.</exception>
protected override TransferStatus CompleteTransferImpl(string transferId)
{
return(ReaderService.CompleteTransfer(transferId));
}