Progress bar for lengthy operation on data source execute query in ax

Write this following method any on class:

Public static client SysOperationProgress showWaitDialog(str _text = "Extracting record for you, please wait...")

{

    #AviFiles

    SysOperationProgress waitDialog;

    waitDialog = new SysOperationProgress(1, true, strLen(_text));

    waitDialog.setCaption("Processing...");

  //  waitDialog.setTotal(100);

    waitDialog.setCount(1);

    waitDialog.setAnimation(#AviStopWatch);

    waitDialog.setText(_text);

    return waitDialog;

}

Call from datasource executequery() method:

public void executeQuery()

{

   SysOperationProgress waitdialog;

   ;

   waitdialog = global::showWaitDialog();  // startLengthyOperation();

   super();

   waitdialog.hide();  //  endLengthyOperation();

}