Role Management Tool to install or configure Microsoft .NET Framework 3.5

You must use the Role Management Tool to install or configure Microsoft .NET Framework 3.5

This is because Windows 2008 R2 comes with pre-installed .Net Framework 3.5.1. You just require to enable this feature from “Server Manager”.

Using Role management tool, you can easily enable .Net 3.5 framework on your web hosting server or development server.