C# versions

                                                                 C# -Versions

 Features added in versions
 
C# 2.0 in November 2005
    Generics
    Partial types
    Anonymous methods
    Iterators
    Nullable types
    Getter/setter separate accessibility
    Method group conversions (delegates)
    Co- and Contra-variance for delegates
    Static classes
    Delegate inference

C# 3.0 in November 2007

    Implicitly typed local variables
    Object and collection initializers
    Auto-Implemented properties
    Anonymous types
    Extension methods
    Query expressions
    Lambda expressions
    Expression trees
    Partial methods

C# 4.0 April 2010

    Dynamic binding
    Named and optional arguments
    Tuples
    Generic co- and contravariance
    Embedded interop types ("NoPIA")

C# 5.0 in August 2012

    Asynchronous methods
    Caller info attributes

C# 6.0 in July 2015

    Compiler-as-a-service (Roslyn)
    Import of static type members into namespace
    Exception filters
    Await in catch/finally blocks
    Auto property initializers
    Default values for getter-only properties
    Expression-bodied members
    Null propagator (null-conditional operator, succinct null checking)
    String Interpolation
    nameof operator
    Dictionary initializer

C# 7.0  proposals

    Local functions
    Pattern matching
    Records / algebraic data types
    Nullability tracking
    Async streams and disposal
    Strongly typed access to wire formats