How to convert PDF file to JPEG file

Hi,
 I am a Software developer working on dgitial paper.I am not getting how to convert the PDF files to JPEG file in .Net windows Application.If any knows how to do this please help me in doing this by giving the code.
I am waiting for u r replay & code how to convert the PDF files to JPEG files in .Net windows application.

i am also using this code but it is not working..

Dim

pdf As PDFOCXLib.PdfocxClass
 pdf.OpenPDFFile("c:\a.pdf", "", "", 72) = True

Thanks & Regards

Siraj Ahmed