helloworld-itextpdf.cs

namespace ReportSamples {
  class HelloWorld {
    public static void Main() {
      Document document = new Document();
      PdfWriter.GetInstance(document, new FileStream("HelloWorld.pdf", FileMode.Create));
      document.Open();
      document.Add(new Paragraph("Hello World!"));
      document.Close();
      System.Diagnostics.Process.Start("HelloWorld.pdf");
    }
  }
}

helloworld-reportnet.cs

namespace ReportSamples {
  class HelloWorld {
    public static void Main() {
      Report report = new Report(new PdfFormatter());
      FontDef fd = new FontDef(report, "Helvetica");
      FontProp fp = new FontPropMM(fd, 25);
      Page page = new Page(report);
      page.AddCenteredMM(80, new RepString(fp, "Hello World!"));
      RT.ViewPDF(report, "HelloWorld.pdf");
    }
  }
}