private void button2_Click(object sender, EventArgs e)
{
  List<int> sections = new List<int>();

  string xmlAddress = textBox1.Text;

  XmlToWoodenBeamList beamList = new XmlToWoodenBeamList(xmlAddress);

  List<WoodenBeam> beams = beamList.WoodenBeamList;

  foreach (WoodenBeam wb in beams)
  {
    if (!sections.Contains(wb.section))
    {
      sections.Add(wb.section);
    }
  }

  foreach (int s in sections)
  {
    Document document = app.NewFamilyDocument(templateFileName);

    Transaction transaction = new Transaction(document, s.ToString());

    transaction.Start();

    FailureHandlingOptions failureHandlingOptions = transaction.GetFailureHandlingOptions();
    failureHandlingOptions.SetFailuresPreprocessor(new RoofWarningSwallower());
    transaction.SetFailureHandlingOptions(failureHandlingOptions);

    progressBar1.Maximum = beams.Count();
    progressBar1.Minimum = 0;

    int allNumber = 0;
    int countName = 0;

    foreach (WoodenBeam wb in beams)
    {
      if (wb.section == s)
      {
        wb.CreateSweep(document);
        progressBar1.Increment(1);
        allNumber++;
      }
    }

    foreach (WoodenBeam wb in beams)
    {
      if (wb.section == s)
      {
        Sweep sw = wb.GenerateSweep();
      }
    }

    transaction.Commit();

    document.SaveAs(this.savedFileName + "Field" + s.ToString()+countName.ToString()+".rfa");

    filePaths.Add(this.savedFileName + "Field" + s.ToString() + countName.ToString() + ".rfa");

    countName++;
  }

  Document documentCurrent = app.NewFamilyDocument(templateFileName);

  if (filePaths != null)
  {
    Thread th = new Thread(new ThreadStart(this.ShowProgress));
    th.Start();
    this.Dispose();

    //initial the progressBar
    progressBarForm.progressBar1.Maximum = filePaths.Count();
    progressBarForm.progressBar1.Minimum = 0;

    //begin the transaction
    Transaction transaction = new Transaction(documentCurrent, "begin load");

    transaction.Start();

    foreach (string filePath in filePaths)
    {
      Family family = null;
      if (!documentCurrent.LoadFamily(filePath, out family))
      {
        throw new Exception("Unable to load " + filePath);
      }

      // Loop through table symbols and add a new table for each
      FamilySymbolSetIterator symbolItor = family.Symbols.ForwardIterator();

      while (symbolItor.MoveNext())
      {
        FamilySymbol symbol = symbolItor.Current as FamilySymbol;
        XYZ location = new XYZ(0, 0, 0);

        FamilyInstance insta = documentCurrent.FamilyCreate.NewFamilyInstance(location, symbol, StructuralType.NonStructural);
        break;
      }

      progressBarForm.progressBar1.Increment(1);
    }
    transaction.Commit();

    documentCurrent.SaveAs(this.savedFileName + ".rfa");

    th.Abort();
    progressBarForm.Dispose();
  }
}