I recently was working on a project where I needed to upload a file to a webserver. I got it all working but did not know (at least not right away) that the webserver actually collects the file in memory before writing it to disk. So, when I uploaded a 1G file, guess how much memory I used? In any case MS talks about a way to deal with downloading a file to avoid this problem here: http://support.microsoft.com/kb/812406/EN-US/