Net Framework 2.0, 3.0 and 3.5

. NET Framework 2.0, 3.0, and 3.5 are in the following relationship :. net Framework 2.0 = CLR 2.0 + FCL (framework class library ). net Framework 3.0 =. net Framework 2.0 + SP1 + WPF + WCF + WF + cardspace.net Framework 3.5 = ..net framework 3.0 + SP2 + new Compiler

The CLR of the three versions of the Framework is 2.0. Therefore, the runtime of Asp.net is only 1.1 and 2.0. New functions such as LINQ are implemented only by adding some new class libraries to the new compiler, version 3.5 does not significantly upgrade CLR.
 
Vs2008 supports development projects in versions 2.0, 3.0, and 3.5. The vs2005 project can be smoothly upgraded to vs2008, and vs2008 is used as a vs2005 project, the compilers and class libraries used are the same as vs2005, but they provide a better development environment.