[RE-POST!] Convert RTF to PDF in RTF format

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C#

i want to convert rft file or RichtextBox.text to pdf in rft format,
i tried 3rd party tool but its seems evaluation version so i cannot use this in my project,

and i tried acrobat dll that also not woring my code s below

string rtfPath = @"D:\test1.rtf";
  string pdfPath = @"D:\test1.pdf";

AcroAVDocClass _acroDoc = new AcroAVDocClass();
AcroPDDoc _pdDoc = null;


_acroDoc.Open(rtfPath, "text");
_pdDoc = (Acrobat.AcroPDDoc)(_acroDoc.GetPDDoc());

_pdDoc.Save((short)Acrobat.PDSaveFlags.PDSaveCopy, pdfPath);

_pdDoc.Close();
_pdDoc = null;
_acroDoc.Close(1);
_acroDoc = null;<

Any one help me to do the same