this is my code, hope it helps
string Pdf = "FullResult(" + DateTime.Now.ToString("ddMMMyyyyhhmmttss") + ").pdf";
string PdfPath = Server.MapPath(Pdf);
Document doc = new Document(PageSize.A4, 20, 20, 20, 20);
PdfWriter.GetInstance(doc, new FileStream(PdfPath, FileMode.Create));
string TestName = "Test Name: " ;
doc.Open();
iTextSharp.text.Chunk c2 = new Chunk(GetPData(), FontFactory.GetFont("Arial", 16));
Paragraph p = new Paragraph(c2);
Paragraph Test = new Paragraph(TestName, FontFactory.GetFont("Arial", 16));
doc.Add(Chunk.NEWLINE);
doc.Add(p);
doc.Add(new Paragraph(" "));
doc.Add(new Paragraph(Test));
doc.Add(img);
doc.Add(new Paragraph(" "));
doc.Close();