accessing and modifying .jpg file attributes

if you right click on a .jpg file -> properties -> summary tab,
you can set some of the attributes of that file (title, subject,
author, comments, etc.).

how do you access this information from a .jpg file and modify it,
using a VB.NET application? What I'd like to do:

1. have user browse for path of a particular .jpg file (i know how to
do this)
2. extract the current "subject" attribute information (don't know)
3. enable the user to enter a new "subject" attribute of that file
(don't know)
4. set the user's input into the "subject" attribute of the .jpg file
(don't know)

any help would rock my face off! i've done countless google searches
on this, and nothing so far. i thought i'd post it to a forum to see
if people could help out.

thanks!!!!
- Ian


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