C#.NET Versions along with added features by version wise.

In 2001
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.NET 1.0
Initial C# Released.


In 2003
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.NET 1.1
C# 1.2 released

In 2005
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.NET 2.0
C#2.0(Generics, Anonymous Methods, Iterations, Nullable Types)

In 2007
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.NET 3.0
C#3.0 (Object Initializers, Anonymous Types, Extension methods, lambda Expressions)

In 2010
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.NET 4.0
C# 4.0( Dynamic Binding, Named& optional Arguments)