Editing docx files in web application

I have an asp.net 4.0 web application.  I need to be able to give the user a docx file, allow the user to edit and save back to the server.
I am using aspose to merge the document which works great.  If I let the user download the doc I cannot figure out how to easily get it back to the server and linked to the correct record.  I would like to do something like Dropbox is doing with OWA.  You can edit a word doc in the browser using Word Online and then save.  I cannot seem to find any documentation on this.  Can someone point me in the right direction?
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Randy DownsOWNERCommented:
Maybe this will help.

there are a number of considerations you'd need to make before doing this.  From a technical point of view, the Office Web Apps Server is designed to support your scenario.  However, there are several documented protocols you'd need to implement on the host (your Asp.Net application containing the document store.)  For example, viewing requires the WOPI protocol, and editing would require the FSSHTTPB protocol (aka Cobalt protocol) as well.
There is also licensing considerations.  The Office Web Apps Server license is free for viewing, but paid for editing.


or the manipulation of word documents you can use DocX. With this you can read/write from/to word documents (docx not doc). This however is a long way from editing your document in a google docs like manner...

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