I need help for user specific Cache...

We have a web application, where we use the session to store the user specific
data,and also we have datagrids which has paging and using Dataset stored in
session.since these dataset r holding large amount of data ie about 1000 recs min ,
and v have such datagrids throught the application ,according to the customer
request.

We r planning to replace the session object by Cache object. since all these
data are user specific, and the Cache object is of Application scope,Can u suggest
me the methods the keep these cache items user specific.

I planned to concatnate the session id with the cache item name,so when accesed the cache item created by the user will be unique.
Is there any other method to make cache items user specific.


thnx...