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C# 2.0 - Generics - Nullable types - Iterators - Anonymouse methods (람다식의 조상) - partial classes - static classes C# 3.0 - LINQ (Language Integrated Query) - Implicitly typed local variables (var keyword) - Object initializers - Lambda expressions - Extension methods - Query expressions - Expression trees - Automatic properties - Partial methods C# 4.0 - Dynamic binding - Optional parameters and named arguments - Type variance with generic interfaces and delegates - COM interoperability improvements C# 5.0 - Asynchronous functions ( async  and  await ) C# 6.0 - Null-conditional operator - Expression-bodied functions - Property initializers - Index initializers - String interpolation - Exception filters ( when ) -  using static  directives - nameof C# 7.0 - Numerical literal improvements ex) int million = 1_000_000; (컴파일 시 "_" 무시됨) -  out  variables and discards - Patterns 1)  is  variables 1 2 3 4 5 void  Foo ( object  x) {      if  (x  is   string  s)      Console . WriteLine