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List:       patchmanagement
Subject:    Aaron Stebner's WebLog : Mailbag: Do I need still need older versions of the .NET Framework on my sy
From:       Susan Bradley <sbradcpa () pacbell ! net>
Date:       2009-04-22 23:53:22
Message-ID: 49EFADF2.4080704 () pacbell ! net
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Aaron Stebner's WebLog : Mailbag: Do I need still need older versions of 
the .NET Framework on my system after installing .NET Framework 3.5 SP1?:
http://blogs.msdn.com/astebner/archive/2009/04/20/9557946.aspx


Mailbag: Do I need still need older versions of the .NET Framework on my 
system after installing .NET Framework 3.5 SP1?
Question:

I recently installed the .NET Framework 3.5 SP1 on my system. 
Afterwards, I looked in Add/Remove Programs, and it shows that I have 
all of the following versions of the .NET Framework installed on my system:

Microsoft .NET Framework 1.0
Microsoft .NET Framework 1.1
Microsoft .NET Framework 2.0 SP2
Microsoft .NET Framework 3.0 SP2
Microsoft .NET Framework 3.5 SP1
Do I need any of these older versions of the .NET Framework now that 
I’ve installed the .NET Framework 3.5 SP1, or can I safely uninstall them?

Answer:

When you install the .NET Framework 3.5 SP1, it will also install the 
..NET Framework 2.0 SP2 and the .NET Framework 3.0 SP2 behind the scenes. 
You cannot use the .NET Framework 3.5 SP1 unless you also have the .NET 
Framework 2.0 SP2 and 3.0 SP2 installed. Therefore, you will not be 
allowed to uninstall the .NET Framework 2.0 SP2 or 3.0 SP2 if you have 
the .NET Framework 3.5 SP1 installed. If you try to uninstall those 
versions of the .NET Framework, their uninstall processes will block and 
tell you that they are needed by another application on your system.

The .NET Framework 1.0 and .NET Framework 1.1 can be installed 
side-by-side with the .NET Framework 2.0, 3.0 and 3.5. Most applications 
that were created for the .NET Framework 1.0 or 1.1 will automatically 
use the .NET Framework 2.0 instead if it is installed on the system. In 
most cases, that means you do not need to keep the .NET Framework 1.0 or 
1.1 installed on your system if you already have the .NET Framework 2.0 
installed.

However, there are some applications that are configured to require a 
specific version of the .NET Framework, even if later versions of the 
..NET Framework are installed. If you have any applications like that on 
your system and try to run them without installing the .NET Framework 
1.0 or 1.1, you will get an error message that looks like the following:

---------------------------
MyApplication.exe - .NET Framework Initialization Error
---------------------------
To run this application, you first must install one of the following 
versions of the .NET Framework:
v1.1.4322
Contact your application publisher for instructions about obtaining the 
appropriate version of the .NET Framework.
---------------------------
OK
---------------------------

In the above error message, the version number will be v1.0.3705 if you 
need to install the .NET Framework 1.0, and it will be v1.1.4322 if you 
need to install the .NET Framework 1.1.

If you end up seeing any error messages like this, you can re-install 
the .NET Framework 1.0 or 1.1 in order to resolve the errors. If you 
don't end up seeing any error messages like this, then you don't need to 
worry about re-installing the .NET Framework 1.0 or 1.1.



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