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How To enable dotNet3.5 offline & Online mode in window 8

Method 1: When you are Online, connected to Internet.
In order to install the following window click on the .NET Framework 3.5 (included .NET 2.0 and 3.0) select it & click OK
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Now, it will download the entire package from the internet & install the .NET Framework feature.
Method 2: When you are Offline and not connected to Internet
If you open CMD.EXE with Administrative Privileges i.e. at elevated level & run the this DISM command dism /online /get-features you will see that from the State that .NET Framework is not part of the Operating System.
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So the first thing you need to do is to copy the required package to local machine before you run the command to install .NET Framework. To do that use Windows 8 ISO/DVD/USB Media. You need to copy SXS folder to local machine located at D:\sources\sxs (In this case D: your drive letter on which you have loaded Windows 8 Media)
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You can also use the following command to copy this folder locally. xcopy d:\sxs\*.* c:\sxs /s
Once completed, in order to install this feature you can run the following command dism /online /enable-feature /featurename:NetFx3 /All /SourceC:\sxs /LimitAccess  and hit Enter
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After completing the installation of .NET Framework 3.5 you can see that the feature is enabled in the Control Panel –> Program and Features
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Bingo. Now you can enable .NET Framework feature on Windows 8 without needing of an internet connection.
Enjoy
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