/// <summary>
        /// This method requires a user id in order to get all the prestation indicators of that user.
        /// </summary>
        /// <param name="id">The id</param>
        /// <returns>Returns a list of all the prestation indicators of the selected user.</returns>
        public List <PrestationIndicator> getPrestationIndicatorsById(int id)
        {
            // return list of prestation indicators
            QueryStrings queryStrings         = new QueryStrings();
            List <PrestationIndicator> piList = queryStrings.getPrestationIndicatorsById(id);

            return(piList);
        }