public UAReturn ChangeMissingVals(string colName, string colProp, List<string> newMisVal, string mistype, string datasetnameorindex) { UAReturn r; ServerDataSource dataSource = new ServerDataSource(_userSession.DefaultDispatcher, "", datasetnameorindex); if ((r = _userSession.DefaultDispatcher.changeMissing(colName, colProp, newMisVal, mistype, dataSource)).Success) { return r; } return null; }