public async Task <IHttpActionResult> UploadFile(Guid fileAllocationId)
        {
            var    httpRequest = HttpContext.Current.Request;
            string fileName    = "";

            if (httpRequest.Files.Count > 0)
            {
                foreach (string file in httpRequest.Files)
                {
                    var postedFile = httpRequest.Files[file];
                    var ext        = Path.GetExtension(postedFile.FileName);

                    fileName = fileAllocationId + ext;
                    var filePath = HttpContext.Current.Server.MapPath("~/UploadedDocuments/" + fileName);

                    postedFile.SaveAs(filePath);
                }

                var fileAllocation = await _fileAllocationService.GetByIdAsync(fileAllocationId);

                if (fileAllocation != null)
                {
                    fileAllocation.DocumentFileName = fileName;

                    _fileAllocationService.Update(fileAllocation);
                    await _fileAllocationService.CommitAsync();
                }
            }
            else
            {
                return(BadRequest("Please attach file."));
            }

            return(Ok(fileName));
        }
        public async Task <IHttpActionResult> PutFileAllocationAsync(Guid id, FileAllocation fileAllocation)
        {
            if (!ModelState.IsValid)
            {
                return(BadRequest(ModelState));
            }

            if (id != fileAllocation.Id)
            {
                return(BadRequest());
            }

            try
            {
                _fileAllocationService.Update(fileAllocation);
                await _fileAllocationService.CommitAsync();
            }
            catch (DbUpdateConcurrencyException)
            {
                if (!await FileAllocationExistsAsync(id))
                {
                    return(NotFound());
                }
                else
                {
                    throw;
                }
            }

            return(Ok());
        }