Rollback if null
<p>I was reading articles about rollback transaction and can't find something like I need. Assume I have a user table. User can update his/her records but I want to rollback if entered value is null. I know there are lots of simple ways to do this like checking with c# if it is null and things like that but point in here is understanding rollback. How can I use rollback with if(null) code ?</p>