How to install .NET 3.0 RTM?
If you have windows xp,sp2 or windows 2003,you can follow these instructions to install .NET 3.0 (all downloads are free, so you can install it)
STEP1:
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You can install Visual c# express edition from here (Its free, so you can download from here)
https://msdn.microsoft.com/vstudio/express/visualcsharp/download/
STEp2:
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Please use following instructions to install .NET 3.0
(a)
Install .NET 3.0 runtime
(b)
install windows SDK
(c)
Install Visual studio extensions
After this, you can write WCF applications in vC# express edition