Windows 8 .NET 3.5 issue

Windows 8 is really awesome but at times can be a pain in the ass as it asks for .NET 3.5 installation when actually it already has it as a component. Now what happens when you try to run an application that requires Microsoft .NET 3.5, windows starts downloading files and it is literally impossible to get it done in first shot... infact it may even take 5-6-7 attempts to get it completely installed and working.
The good news is that yo don't need to download a thing from internet and infact you can activate >net 3.5 when offline...
here is a method that is extremely easy that I came across while googling a bit myself.
Method I:
1. Insert your Windows 8 installation DVD in DVD drive(lets suppose drive is M:)
2. do to search in Windows 8 and type cmd
3. run command prompt in admin mode(when Command Prompt shows up right click on it and you will see run as administrator in the bottom tab)
4. type following command and press enter

dism.exe /online /enable-feature /featurename:NetFX3 /Source:M:\sources\sxs /LimitAccess

remember to replace M by the drive letter of your DVD drive where you have inserted the DVD
volla... rest will be taken care off by itself and you are through... you have .NET 3.5 activated