public static bool UploadTenderingFile(int tenderingId, TenderingIndex docIndex, int?contractorId, string version, Grid layoutRoot, int?advertisementId = null, int?meetingId = null, int?warrantyId = null)
        {
            TenderingDocumentFile         f   = new TenderingDocumentFile();
            TenderingDocumentFileRelation rel = new TenderingDocumentFileRelation();

            rel.ContractorId        = contractorId;
            rel.TenderingDocumentId = DataManagement.RetrieveTenderingDocumentId(docIndex);
            if (rel.TenderingDocumentId == -1)
            {
                return(false);
            }
            rel.TenderingId     = tenderingId;
            rel.AdvertisementId = advertisementId;
            rel.MeetingId       = meetingId;
            rel.WarrantyId      = warrantyId;
            f.Version           = version;
            f.AttachedDate      = DateTime.Now;
            f.FileGuid          = Guid.NewGuid();
            string fileLocation = OpenFileHandler.OpenFileToUpload();

            if (fileLocation == null)
            {
                return(false);
            }
            layoutRoot.Children.Add(busy);
            Task <bool> .Factory.StartNew(delegate
            {
                f.FileContent = OpenFileHandler.GetFileFromLocation(fileLocation);
                f.Name        = System.IO.Path.GetFileName(fileLocation);

                if (DataManagement.AddTenderingFile(f) != -1)
                {
                    rel.TenderingDocumentFileId = f.TenderingDocumentFileId;
                    if (DataManagement.AddTenderingFileRelation(rel) == -1)
                    {
                        return(false);
                    }
                    f = null;
                    GC.Collect();
                    return(true);
                }
                else
                {
                    return(false);
                }
            }).ContinueWith(prev =>
            {
                layoutRoot.Children.Remove(busy);
                bool result = prev.Result;
                if (result)
                {
                    ErrorHandler.NotifyUser("فایل با موفقیت ثبت شد.");
                    if (TransactionFinished != null)
                    {
                        TransactionFinished();
                    }
                }
                else
                {
                    ErrorHandler.ShowErrorMessage("ثبت فایل امکان پذیر نبود لطفا دوباره سعی کنید.");
                }
            }, TaskScheduler.FromCurrentSynchronizationContext());

            return(true);
        }