Is it possible to use itextsharp to convert postscript to a PDF ? If not is there another way to do it in .net ?
Converting PostScript to PDF is called "distilling". iText and iTextSharp do not support distilling. Ghostscript will be your only FOSS solution.
You could use Ghostscript as it's explained here:
http://hi.baidu.com/lqyidxa_igfv/blog/item/df2037b394539fa0d9335a94.html
来源：https://stackoverflow.com/questions/4970511/itextsharp-postscript-to-pdf