Do I need certification? then which one is suitable for me?

Question

Hi to all,
i am be.ece student. because of interest in software field, i start my carrier with dot net. so i joined in a project center and start learning dot net after passed out. then i start developing small level softwares for ordinary shops as windows application. i did this as much as i know. i even didnt use 3 tier arch. after that came to know and learn it. then did some project in that. now i decide to change to web application.Now my question is,
i. i am not an expert in best coding. but however ill complete the task. should i again study in institution?
ii. i want to work with web application. because i decide that my next job should be in web application. for this, should i get any certification. then which certification is best for me and will be helpful for my carrier.
please advice me.....
thanks in advance....