Is there a reason for testing applications when converting from 2.0 to 3.5.

Some people say that 3.5 is on top of 2.0 so when converting an application there is no need to test.
The application will run identically. Is this true? I need concrete proof.

Who is Participating?

[Product update] Infrastructure Analysis Tool is now available with Business Accounts.Learn More

I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

Regardless of what is said, you must always test thoroughly your application if you are doing some major change like moving your application from one .net framework to another.
You never know , if you are new that if some methods / properties that your application is using are no longer available or obsolete in the new framework, there is something bigger and better out there which if replaced in your code can have major performance improvements and stuff like that.
I would certainly not assume my application to be running successfully without testing in the new framework (especially when it was not built for the same!)

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
Actually there is reason.
I had the opportunity to experience that myself. I converted a small appl from 2.0 to 3.5.
Conversion happened seamlessly.
However there was one page that was working before that went rogue on me. I used Request.ApplicationPath to help build some links dynamically. I was working fine in 2.0, not anymore in 3.5. I had to do a quick work around.

If you have time a resource, test. If you dont, try.
See another example of what I was talking about :)
mathieu_cuprykAuthor Commented:
great answer tech.
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
.NET Programming

From novice to tech pro — start learning today.