as title, i would like to know they are standalone, or newer version will overwrite the older version? because i'm afraid if it overwrites, some of my program might not work

iianm, newer version is backward compatible with older version.

yes true...and it doesn't overwrite...you can try to install and have a look at your add remove program list. Well at least in XP, i can say that is the case.

Any problem can uninstall it?

I'm still hesitating to install version 3.0

It's technically supposed to be backwards compatible, but bugfixes and patches make that a little hard. They are discrete installs though, so feel free to install 1.0, 2.0, 3.0 and 3.5 side by side.

.NET Framework can run side-by-side, that means any version can run in parallel without interrupting or overrdding files from the other versions.

.NET Framework can run side-by-side and each version number upgrade contain supports for previous version. For example, .NET Framework 2.0 support 1.0 and 1.1 etc. Starting from .NET Framework 3.0, Microsoft distributes all older .NET Framework with 3.0 installer, so basically you have all version installed. If you just using normal .NET applications, for now, .NET 2.0 SP1 is enough, unless you're running .NET applications that explicitly targets .NET 3.0 or .NET 3.5 environments...

the latest .Net FrameWork is 3.5...

ah dude - we all know that already - this is about isntalling different version of .NET Framework side-by-side.

Buy .Net FrameWork 3.5 have to download using the program.
When you download from microsoft office, The program will download the installer. You have to span a lot of time...

no you don't because there's full package installer available at Microsoft's server:


check before you post non-sense...

yeap, can be installed side by side, and manageable from your IIS.
backward compatible.. i doubt so.. application developed in 1.0 once associated with 2.0 or higher in IIS, it may not work. you will have to tweak here and there such as web.config, some syntaxes etc. microsux..