public IActionResult Del(int[] delList)
        {
            int flag = 0;

            for (int i = 0; i < delList.Length; i++)
            {
                int result = materialManager.Del(delList[i]);
                if (result > 0)
                {
                    flag++;
                }
            }
            if (flag == delList.Length)
            {
                return(Json("Success"));
            }
            else
            {
                return(Json("Fail"));
            }
        }