How to enable .NET Framework in MS Windows

The following are the steps to enable .NET Framework 3.5 (include .NET 2.0 and 3.0) feature in offline mode :

Step 1 :
Insert Windows 8 DVD or mount ISO image.
The source of this feature can be found in folder E:\sources\sxs.
(In this case E: the user’s drive letter on which
the user has loaded Windows 8 Media.)
Step 2 :
Open CMD.EXE with Administrative Privileges.
Run the following command Dism.exe /online /enable-feature /featurename:NetFX3 /All /Source:E:\sources\sxs /LimitAccess, and hit Enter.