how to deliver bug free application to clint 2013

Question

i have developed application and deliver with 50 bug to client 2010.same application deliver to client 2013 but dont'want any bug . how?? how to deliver bug free application to client 2013.

Jignesh Trivedi · Answer

hi do proper unit testing and QA testing.. considering all possible Scenario. I think this is only solution to deliver bug free s/w... :)