Can any one suggest me which tool can be used for testing a application written in VB and .Net.
This post may give you some idea and if you some browsing in the automated tools forum you will find other info.
I have not failed. I've just found 10,000 ways that won't work" --Thomas Edison
Check out QTP and Test Partner.
TestComplete may be applicable. And it's highly cheaper than QTP.
just to record and play without coding, try "Automation Anywhere" tool.
It will be helpful to you.