public ActionResult Index(string rootSharingId, int?contentId)
        {
            SystemFile file = _fileManager.AccessSharedFile(rootSharingId, contentId);

            if (file != null)
            {
                if (file.IsFile)
                {
                    if (contentId != null)
                    {
                        return(null);
                    }
                    else
                    {
                        ViewBag.Root = rootSharingId;
                        return(View("SharedInfo", file));
                    }
                }
                else
                {
                    ViewBag.Folder        = file;
                    ViewBag.RootSharingId = rootSharingId;
                    return(View("SharedFolder", _fileManager.GetFolderContent(file.Id).Where(x => x.Sharing_Atribute != 1)));
                }
            }
            else
            {
                return(null);
            }
        }