C# Version History

C# version 1.0

It is released with the Visual Studio .NET in 2002.

The features included in this version is:

• Class
• Structs
• Interfaces
• Events
• Properties
• Statements
• Attributes
• Operators and expressions

C# version 1.2

It is published in the 2003 with Visual Studio .NET. It contains the small enhancements to the language.

C# version 2.0

It is published in the 2005 along with Visual Studio 2005.

• Generic
• Static classes
• Nullable value types
• Partial types
• Iterators

C# version 3.0

It came in late 2007 with the Visual studio 2008. The 3.5 version also came after 3.0. It creates a major change in the C# growth. The query expression feature of the C# is known as Language Integrated Query (LINQ).

Features included in this version:

• Lambda expressions
• Query expressions
• Expression type
• Extension method
• Partial methods

C# version 4.0

It is released in 2010 with same version of visual studio. The language becomes more elegant with the release of this version.

Features come up in this version:

• The introduction of dynamic keyword
• Generic covariant and contravariant
• Named/optional arguments

C# version 5.0

It was released in 2012. The async and await model was introduced in this version.

Features introduced in the version are:

• Asynchronous members
• Caller info attributes.

C# version 6.0

It is released in 2015. It introduced the bashing features after 3.0 and 5.0.

The features are:

• Compile-as-a-service.
• String Interpolation
• Nameof Operator
• Exception filters
• Awaits in catch/finally block
• Auto property Initializers

C# version 7.0

It is released in the 2017. It has some interesting features. But this version does not complier-as-a-service.

• Local functions
• Digital Separators
• Binary literals.
• Pattern Matching
• Ref returns and locals

C# version 7.1

It is released in 2017.

The main features are:

• Async main
• Default literal expression.
• Inferred Tuple element names

C# version 7.2

It is published in 2017.

The main features are:

• private protected access modifier
• Leading underscores in numeric literals
• Non-trailing named argument.

C# version 7.3

It is published in 2018.

The main features are:

• Reassigning ref local variables.
• Using additional generic constraints.
• Accessing fixed fields without pinning

C# version 8.0

It released in 2019. The main features are:

• using declarations
• static local functions
• readonly struct members
• Default interface members
• Switch expressions
• Indices and range
• Disposable ref struct

C# version 9.0

It is released in 2020.

• Records
• Init only setters
• Top-level statement
• Functions pointers
• Module Initializers
• Covariant return types.
• Native Sized integers

TABLE OF VERSIONS