Converting a document to pdf on sever side .NET

I want to convert a document .doc, .docx or .txt to pdf but i want only the server to fill requierements. What i mean is i don`t want the user to need to have word, adobe reader or anything installed on their machine. I just want a user to upload a document file and the s开发者_C百科erver convert it and store it into pdf. Similar to what scribd does.

The easiest way that I've done this is to install a virtual pdf printer on the server, and print the document.

I used Bullzip PDF. You can create a runonce.ini that stores settings for the next print and the printer will silently print the document with whatever name/location/etc. is stored in runonce.

What about a control like

UseOffice.net

(Not free)