Merge multiple PDFs to PostScript with GhostScript / C#

Greetings,
Can anyone suggest how to merge multiple PDF files into a single PostScript file when using GhostScript with C#
 
At the command line, it is:
gswin32c.exe -dNOPAUSE -dBATCH -sDEVICE=ps2write -sOutputFile=outfile.ps Infile1.pdf Infile2.pdf
  
    params.Add("-q");
    params.Add("-dQUIET");
    params.Add("-dNOPAUSE");
    params.Add("-dBATCH");
    params.Add("-P-");
    params.Add("-dPARANOIDSAFER");
    params.Add("-dNOPROMPT");
    params.Add("-sDEVICE=ps2write");
    params.Add("-dLanguageLevel=3);
    params.Add("-dASCII85DecodePages=false");
    params.Add("-sOutputFile=outfile.ps");
    params.Add("InFile1.PDF inFile2.PDF");
 
 
It is easy to convert multiple PDF files to a single PostScript file from the command line, but I need to do it in a program. I cannot get it to work.
I figure it would be something like:
    params.Add("InFile1.PDF inFile2.PDF"); 
as the last parameter, but no such luck

Any suggestions would be greatly appreciated. Thanks, Mike

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