public Tuple<IEnumerable<FolderNode>, IEnumerable<Content>> Folder(int? id)
{
ContentRepository contentRepos = new ContentRepository(unitOfWork);
FolderNodeRepository folderRepos = new FolderNodeRepository(unitOfWork);
return new Tuple<IEnumerable<FolderNode>, IEnumerable<Content>>(folderRepos.FindByFolder(id), contentRepos.FindByFolder(id));
}