New Post: Convert Postscript to PDF

I am trying to convert a Postscript file to PDF, but I seem to be missing part of it.

What I have is:

public void Convert(String fileName, String outputPath)
{
    using (var psStream = File.Open(fileName, FileMode.Open, FileAccess.Read))
    {
        using (var gs = new Ghostscript.NET.Rasterizer.GhostscriptRasterizer())
        {
            gs.Open(psStream);
            gs.CustomSwitches.Add("-q");
            gs.CustomSwitches.Add("-dSAFER");
            gs.CustomSwitches.Add("-dBATCH");
            gs.CustomSwitches.Add("-dNOPAUSE");
            gs.CustomSwitches.Add("-dNOPROMPT");
            gs.CustomSwitches.Add("-r72");
            gs.CustomSwitches.Add("-sPAPERSIZE=a4");
            gs.CustomSwitches.Add(@"-sOutputFile=" + outputPath);
            gs.CustomSwitches.Add(@"-f" + fileName);
        }
    }
}

Now that this part is done, what do I call to do the actual conversion? There is no Convert, Write or Save method that I could find in the documentation.