Programatically adding users to List based on User Job levels.

Hi,

How can I give access to SharePoint lists programmatically?

For Ex: I have user1 with job level 1 and user 2 with job level 2. I have two share point lists in my site List A and List B.

Now I want to give access to user1 only to List A and user2 to both the lists. Tomorrow if I create a user if I add a user user3 with job level1, he should get access to List A automatically. 



Regards, Shreyas R S