if(csvModel->rowCount() < 40){
      nulls.append("0;0");
  while(csvModel->rowCount() < 40){
      QList<QStandardItem*> nullsList;
      for (QString item : nulls.split(";")) {
          nullsList.append(new QStandardItem(item));
      }
      csvModel->insertRow(csvModel->rowCount(), nullsList);
    }
  } else if (csvModel->rowCount() > 40){
      int rows = csvModel->rowCount() - 40;
      for (int i = 40, j = 0; j < rows; j++, i++) {
          csvModel->removeRow(i);
      }
  }