.net component for previewing office documents

I have a CMS system writt开发者_JAVA百科en in ASP.NET which among other things allows users to upload documents, typically PDF, powerpoint, Word etc.

I am investigating how to implement a preview function so that once the document has been uploaded it would generate a thumbnail of the first page in the document.

Does someone have an idea what libraries, controls are available to achieve this?

I ended up using Adeptol AJAX DocumentViewer. Very easy to implement and works with over 300 formats.