public SalesFileHandlerServiceBase(IFileRepository <int> fileRepository, INewUploadedFileEventHandler newUploadedFileEventHandler)
 {
     _newUploadedFileEventHandler = newUploadedFileEventHandler ?? throw new ArgumentNullException(nameof(newUploadedFileEventHandler));
     _fileRepository = fileRepository ?? throw new ArgumentNullException(nameof(fileRepository));
 }