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ESRI recommends to use the Microsoft .NET Framework 3.5 Service Pack 1 for version 10 and higher:
ArcObjects SDK System Requirements for 10.1
ArcObjects SDK System Requirements for 10.2
So as you can see in this post What are the correct version numbers for C#?What are the correct version numbers for C#? you should learn C# 3.0.
So as you can see in this post What are the correct version numbers for C#? you should learn C# 3.0.