Saving a download from a web server into a file

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I have an app that downloads a number of images from a web server and
displays them. In addition to displaying the images, I also wish to "cache"
them by saving them locally to disk - asynchrounously. I know I can do this
using the following proceedure:

1) perform a beginread on the network stream (result of GetResponseStream)
to write the bytes to a Byte []
2) create a filestream object and do a beginwrite to write the Byte [] to disk

The question is there a way to do this in one step? I would like to write
the network stream directly to disk without having to go through the
intermediate step of writing the data to the Byte []?

I appreciate any assistance that anyone can provide.

thanks,
-joe-