Create lookup method using x++ in Dynamics 365 FO

 void lookup(FormStringControl _control)

    {

        SysTableLookup  tableLookup = SysTableLookup::newParameters(tableNum(EntAssetObjectTable), _control);

        Query                   query           = new Query();

        QueryBuildDataSource    qbdsAssetTable  = query.addDataSource(tableNum(EntAssetObjectTable));

        tableLookup.parmQuery(query);

        tableLookup.addLookupfield(fieldNum(EntAssetObjectTable, SerialID));

        tableLookup.addLookupfield(fieldNum(EntAssetObjectTable, ObjectID));

        tableLookup.addLookupfield(fieldNum(EntAssetObjectTable, Name));        

    

        tableLookup.performFormLookup();

    }