I heard there is a problem or a certain way you must setup IIS in order to run both .NET 2.0 and .NET 3.5 sites concurrently?
We don't see a .NET 3.5 option in the dropdown when configuring the site framework.
Asp – Running .NET 2.0 & 3.5 web sites in IIS 7
.net-2.0.net-3.5asp.netiis-7
Related Solutions
The 3.5 framework still runs on top of the 2.0 CLR so what you are seeing is correct.
Scott Hanselman has a nice blog post about the details of this:
The marketing term ".NET Framework 3.5" refers to a few things. First, LINQ, which is huge, and includes new language compilers for C# and VB. Second, the REST support added to Windows Communication Foundation, as well as, third, the fact that ASP.NET AJAX is included, rather than a separate download as it was before in ASP.NET 2.0. There's a few other things in .NET 3.5, like SP1 of .NET 2.0 to fix bugs, but one way to get an idea of what's been added in .NET 3.5 is to look in
c:\windows\assembly.
Take a look on http://msdn.microsoft.com/en-us/vs2008/bb898654.aspx or download .NET Frameworks 2.0 SP2 and 3.0 SP2 bootstrapper packages. These packages give you separate .NET Framework 2.0 SP2 and .NET Framework 3.0 SP2 installation packages.
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Best Answer
If it's set to run .NET 2.0, it will run .NET 3.5. There is no separate setting for .NET 3.5.