public string Delete()
        {
            string result = "";
            int id = Numerics.GetInt(Request["id"]);
            try
            {
                var repo = new ImportFileRepository();
                var file = repo.GetByID(id);
                if (file != null)
                {
                    string filePath = Server.MapPath("ImportFiles/") + file.URL;
                    if (File.Exists(filePath)) File.Delete(filePath);
                    repo.Delete(file);
                }
                result = JsonResult(true, Resources.Messages.Delete);
            }
            catch (Exception ex)
            {
                result = JsonResult(false, ex.Message);
            }

            return "";
        }