public decimal?Add(QoalaEntities context)
        {
            var outParameter = new ObjectParameter("OUT_ID_COMMENT", typeof(decimal));

            context.SP_INSERT_COMMENT(CONTENT, ID_USER, ID_POST, outParameter);
            if (outParameter.Value == DBNull.Value)
            {
                throw new CreateRecordException();
            }

            ID_COMMENT = (Decimal)outParameter.Value;
            context.Entry(this).State = EntityState.Unchanged;
            return(ID_COMMENT);
        }