web.config and which .NET

Oh well, I have the following web.config and i want to understand whether that web application is running on .net 2.0 or 3.5 or 4. Btw, I will write another post to find this out from assembly in a compiled dll.

In order to understand which .NET framework this application is dependent. You need to know a bit of history of .NET framework.

In the below blocks, I can see that the application is using .NET 3.5.
.NET 2.0 is the base assembly set, so it is not uncommon to see .NET 2.0 assemblies referenced in a .NET 3.5 application.

It is important to underline that .NET 3.5 uses the same CLR (common language runtime) as .NET 2.0, so in essence, .NET 3.5 extends .NET 2.0.

The next major CLR release was in .NET 4.0, with .NET 4.5 thru .NET 4.6.1 using the .NET 4.0 CLR.

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