.NET 后台创建文件夹

public JsonResult AddDisk()
        {
            var data = 0;
            string uid = Request.Cookies["UserID"].Value;
            Login_Users userModel = userBll.getModel(Convert.ToInt32(uid));
            if (string.IsNullOrEmpty(userModel.file_url))
            {
                string DirectoryName = DateTime.Now.ToString("yyyyMMddHHmmssfff");
                string sPath = Server.MapPath("~/Uploads/") + DirectoryName;
                if (!Directory.Exists(sPath))
                {
                    Directory.CreateDirectory(sPath);
                    userModel.file_url = DirectoryName;
                    if (userBll.UpdateUserInfo(userModel) > 0)
                    {
                        data = 1;
                    }
                    else
                    {
                        data = 2;
                    }
                }
            }
            else
            {
                data = 0;//已创建好网盘
            }
            return Json(data);
        }