Update multiple record through MultiSelectionHelper class in AX 2012

Main method of class:

public static void main(Args args)

{

    FormDataSource                      formDataSource;

    TableName                           tableName;

    FormRun                             caller = args.caller();

    MultiSelectionHelper                helper = MultiSelectionHelper::createFromCaller(caller);

;

    // Find correct form data source

    for (i = 1; i <= caller.dataSourceCount(); i++)

    {

        formDataSource = caller.dataSource(i);

        if (formDataSource.table() == tableNum(TableName))

        {

            break;

        }

    }

    //Create ranges for the selected records

    helper.createQueryRanges(formDataSource.queryBuildDataSource(), fieldStr(TableName, RecId));

    // Traverse the selected records

    tableName = helper.getFirst();

    ttsBegin;

   

    while(tableName)

    {

        // Logic placeholder-Start

       

        // Logic placeholder-End

        tableName = helper.getNext();    

    }

    ttsCommit;

}