Best way of passing binary data over ASP.NET web service

I would like to send binary data (files from a document management system)  over an ASP.NET Web service.  I am programming in C#. I assume I would have to use a stream and convert it to a byte array and pass that. Possibly not the most efficient way because of the encoding overhead?  The files could be quite big which also could be a problem. I have also heard of DIME, but not looked into it so far.

Appreciate any suggestions and experience with this.
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Have you tried sockets? If the file is large I wouldn't send it with calls to the web service I'd use TCP sockets instead. You can also compress it and then send it over a socket and decompress it when you receive it.
valoxAuthor Commented:
I settled for passing data as stream. Not efficient, but acceptable in terms of responsetimes.

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