[C#]
PdfDocumentBuilder builder = new PdfDocumentBuilder();
IPdfDocument pdfDoc = builder.CreateDocument();

IPdfPage page = pdfDoc.Pages.AddNew();
IPdfGraphics g = page.Graphics;
IPdfBrush b = PdfBrushFactory.Black;

IPdfFont f = builder.FontFactory.CreateStandardFont(PdfStandardFontFamilies.Helvetica, 20f);

for (int i = 0; i < 100; i++)
  g.DrawString("Hello world!", f, b, new PointF(20, 20 * i));

if (System.IO.File.Exists(fileName))
  System.IO.File.Delete(fileName);

pdfDoc.Save(fileName);

[VB.NET]

Dim builder As New PdfDocumentBuilder()
Dim pdfDoc As IPdfDocument = builder.CreateDocument()

Dim page As IPdfPage = pdfDoc.Pages.AddNew()
Dim g As IPdfGraphics = page.Graphics
Dim b As IPdfBrush = PdfBrushFactory.Black

Dim f As IPdfFont = builder.FontFactory.CreateStandardFont(PdfStandardFontFamilies.Helvetica, 20.0F)

For i As Integer = 0 To 99
    g.DrawString("Hello world!", f, b, New PointF(20, 20 * i))
Next

If System.IO.File.Exists(fileName) Then
    System.IO.File.Delete(fileName)
End If

pdfDoc.Save(fileName)