Set space between rows in pdfptable

You need to use table events to do that.

Java example: http://itextpdf.com/examples/iia.php?id=95

C# example: http://kuujinbo.info/iTextInAction2Ed/index.aspx?ch=Chapter05&ex=PressPreviews

Note that I made the assumption that you want cell spacing (instead of cell padding) similar to what you can see here: http://examples.itextpdf.com/results/part1/chapter05/press_previews.pdf