How to update item bar code in ax 2009

static void updateItemBarCode(Args _args)
{
    SysExcelApplication     application;
    SysExcelWorkbooks       workbooks;
    SysExcelWorkbook        workbook;
    SysExcelWorksheets      worksheets;
    SysExcelWorksheet       worksheet;
    SysExcelCells           cells;
    COMVariantType          type;
    int row;
    Str custID,len;
    Name name;
    FileName filename;
    IntrastatItemCodeId     commCode;
    InventItemBarcode  inventItemBarCode;
    InventTable  inventTable;
    Sysdim      dim;
    ItemId      itemId;
    ItemBarCode itemBarCode;
    BarcodeSetupId barcodeSetupId;
    InventDimId inventDimId;
    ;
    application = SysExcelApplication::construct();
    workbooks = application.workbooks();
    //specify the file path that you want to read
    filename ="C:\\New folder (2)\\Barcode2.xlsx";
    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();
    do
    {
       row++;
       itemId=cells.item(row, 1).value().bStr();
   ttsbegin;
    inventTable = InventTable::find(itemId);
    if (inventTable)
    {
        inventItemBarCode.itemBarCode=cells.item(row, 2).value().bStr();
        inventItemBarCode.barcodeSetupId=cells.item(row, 4).value().bStr();
        inventItemBarCode.inventDimId=cells.item(row, 3).value().bStr();
        inventItemBarCode.itemId=itemId;
        inventItemBarCode.insert();
    }
    ttscommit;
    type = cells.item(row+1, 1).value().variantType();
    }
    while (type != COMVariantType::VT_EMPTY);
    application.quit();
}