public ActionResult GetDocumentPageImage(string path, int?width, int?quality, int pageIndex)
        {
            string appDataPath = Server.MapPath(AppDataVirtualPath);

            byte[] fileBytes = SignatureHandler.GetDocumentPageImage(Path.Combine(appDataPath, path), width, quality, pageIndex);
            if (fileBytes == null)
            {
                return(new EmptyResult());
            }
            else
            {
                return(File(fileBytes, "image/jpeg"));
            }
        }