private void RemoveAlias(FileUploadPart part)
 {
     var folders = _mediaService.GetMediaFolders("Uploads");
     var folder = folders.SingleOrDefault(x => x.Name == part.Guid.ToString());
     if (folder != null)
     {
         var files = _mediaService.GetMediaFiles(folder.MediaPath);
         foreach (var file in files)
         {
             var source = string.Format("{0}-{1}", part.Guid, file.Name);                    
             _aliasService.DeleteBySource(source);
         }
     }
 }
        private void UpdateAlias(FileUploadPart part)
        {
            var folders = _mediaService.GetMediaFolders("Uploads");
            var settings = part.TypePartDefinition.GetFileUploadPartSettings();
            string url;
            if (!string.IsNullOrEmpty(settings.PublicMediaPath))
            {
                url = _tokenizer.Replace(settings.PublicMediaPath, new { Content = part.ContentItem });
            }
            else
            {
                url = part.Guid.ToString();
            }

            var folder = folders.SingleOrDefault(x => x.Name == part.Guid.ToString());
            if (folder != null)
            {
                var files = _mediaService.GetMediaFiles(folder.MediaPath);
                foreach (var file in files)
                {
                    var source = string.Format("{0}-{1}", part.Guid, file.Name);
                    var path = string.Format("uploads/{0}/{1}/{2}", part.Id, url, file.Name);
                    var routeValues = new RouteValueDictionary
                                          {
                                              {"area", "Orchard.Contrib.FileUpload"},
                                              {"controller", "FileUpload"},
                                              {"action", "DownloadFile"},
                                              {"id", part.Id},
                                              {"name", file.Name}
                                          };
                    
                    _aliasService.DeleteBySource(source);
                    _aliasService.Set(path, routeValues, source);
                }
            }
        }