public string GET_LOGICALREF(string TABLENAME, string LOGICALREF, string WHEREFIELDNAME, string WHEREDATA) {
            SqlDatabase sqlSERVICEDB;
            sqlSERVICEDB = new SqlDatabase(M.CONSTR_BMS);
            DataTable DATA = sqlSERVICEDB.ExecuteDataSet(new SqlCommand("SELECT TOP 1 " + LOGICALREF + " FROM " + TABLENAME + " WHERE " + WHEREFIELDNAME + "='" + WHEREDATA + "' ORDER BY LOGICALREF DESC")).Tables[0];
            if (DATA.Rows.Count == 0) {
                return "";
            }
            return DATA.Rows[0][0].ToString();
        }