public HttpResponseMessage Delete([FromBody] string row_num) // row = row number in DB
        {
            int          numEffected = 0;
            Fermentation fer         = new Fermentation();

            try
            {
                numEffected = fer.delete_line(Convert.ToInt32(row_num));

                if (numEffected > 0)
                {
                    return(Request.CreateResponse(HttpStatusCode.OK, numEffected));
                }
                else
                {
                    return(Request.CreateErrorResponse(HttpStatusCode.NotFound, "Not Found"));
                }
            }
            catch (Exception ex)
            {
                return(Request.CreateErrorResponse(HttpStatusCode.InternalServerError, ex.Message));
            }
        }