How to read excel and update record in AX2012 through X++ code

static void POCUpdatePurchaseDetails_JS(Args _args)

{

    SysExcelApplication     application;

    SysExcelWorkbooks       workbooks;

    SysExcelWorkbook        workbook;

    SysExcelWorksheets      worksheets;

    SysExcelWorksheet       worksheet;

    SysExcelCells           cells;

    COMVariantType          type;

    Dialog dialog = new     Dialog("Excel upload utility");

    dialogField             dialogFilename;

    int row;

    int                     totalUpdatedRecord = 0;

    FileName                filename;

    InventTable             inventTable;

    ItemId                  itemId;

    ItemGroup               itemGroup;

    InventTableModule       inventTableModule;

    ;

    application = SysExcelApplication::construct();

    workbooks = application.workbooks();

    dialogFilename = dialog.addField(extendedTypeStr(FilenameOpen),"@SYS53125");

    dialog.filenameLookupTitle("Update data from excel file");

    dialog.filenameLookupFilter(["@SYS28576",'*XLSX', "@SYS28576",'*XLS']);

    if (!dialog.run())

        return;

    filename = dialogFilename.value();

    try

    {

        workbooks.open(filename);

    }

    catch (Exception::Error)

    {

        throw error("File cannot be opened.");

    }

    workbook = workbooks.item(1);

    worksheets = workbook.worksheets();

    worksheet = worksheets.itemFromNum(1);

    cells = worksheet.cells();

    row=1;

    do

    {

        row++;

        itemId = cells.item(row, 1).value().bStr();

        ttsbegin;

        inventTable = InventTable::find(itemId,true);

        inventTableModule=InventTableModule::find(inventTable.ItemId,ModuleInventPurchSales::Purch,true);

        if (inventTable)

        {

            inventTableModule.Price=str2num(cells.item(row, 2).value().bStr());

            inventTableModule.PriceUnit=str2num(cells.item(row, 3).value().bStr());

            inventTableModule.update();

            totalUpdatedRecord++;

        }

        ttscommit;

        type = cells.item(row+1, 1).value().variantType();

    }

    while (type != COMVariantType::VT_EMPTY);

    application.quit();

    info(strFmt('Data updated, total record=%1 record',totalUpdatedRecord));

}