Originally posted by A Babu: hi, in interviews they asked me how you are providing the security for your project.that's why i am asking
Getting a short answer here wouldn't help you much in this case. There are several approaches to securing web sites. I'm sure that, as soon as you told the interviewer which approach you were taking, he/she would have asked you why you chose that approach and what it's advantages and disadvantages are when compared with some of the other approaches.
A Google search with "declarative programmatic security" should give you plenty to read on the subject.