public ActionResult Search(string fileName)
        {
            List <ServerFile> files = null;

            if (WS.IsGoodString(fileName))
            {
                files = new List <ServerFile>();
                string basePath = Session["rootPath"].ToString();
                if (WS.IsGoodString(basePath))
                {
                    WS.FindFile(basePath, files, fileName.ToLower(), this.HttpContext);
                }
            }
            return(View(files));
        }