Want to convert and save the docx file to pdf format with out change in the existing logo in the docx file

Hi,

I would like to want to convert and save the docx file to pdf format with out change in the existing logo in the docx file.

doc.savetopdf();

This 'savetopdf' function is not available to me, do i need to refer any more aspose dlls to get this conversion done? or how exactly i can convert the word docx file to pdf using aspose.net

Thanks for your consideration,

Nikhil