private void button1_Click(object sender, System.EventArgs e)
{
Document document = new Document();
Section section = document.AddSection();
Paragraph paragraph = section.AddParagraph();
paragraph.AddText("Hallo");
FormattedText formText = paragraph.AddFormattedText("formattedText", TextFormat.Bold);
formText.AddFormattedText("formattedTextNested", TextFormat.Italic);
formText.AddDateField();
this.textBox1.Text = TestParagraphIterator.GetBackIterators(paragraph);
}