B1 VISA question

[hussain123]

dear all; i have recently applied for B1 VISA to attend an international conference in usa. However, VISA was refused, some thing which i think was nervouoness and not well prepared for the interview.
this time i am applying again and i have made many changes in form this time, will it create more complications. secondly last time the VO did not ask me to show conference acceptance letter or else. should i give him related documents without he asks?
your suggestions will be highly appreciated.

[jnk]

As long as you know the reason to make changes in the application and you are able to answer there should not be any problem. If visa officer asks then only give. Don't provide any documents voluntary.