private void Increase(TransferEventType eventType) { switch (eventType) { case TransferEventType.Transferred: Interlocked.Increment(ref this.transferredFilesNum); break; case TransferEventType.Skippied: Interlocked.Increment(ref this.skippedFilesNum); break; case TransferEventType.Failed: Interlocked.Increment(ref this.failedFilesNum); break; default: break; } }