C# Versions

C# Versions

Use this page to browse C# by release. Every link below points to a single-feature guide.

For modern releases, this index also notes the month, the .NET release wave, and the Visual Studio wave that Microsoft paired with that version. As of March 20, 2026, C# 15 is still in preview.

Release Timeline

Version	Release window	Runtime pairing	Visual Studio pairing	Status
C# 15.0	March 2026	.NET 11 preview SDK	Visual Studio 2026 Insiders	Preview
C# 14.0	November 2025	.NET 10 SDK	Visual Studio 2026	Released
C# 13.0	November 2024	.NET 9	Visual Studio 2022	Released
C# 12.0	November 2023	.NET 8	Visual Studio 2022	Released
C# 11.0	November 2022	.NET 7	Visual Studio 2022	Released
C# 10.0	November 2021	.NET 6	Visual Studio 2022	Released
C# 9.0	November 2020	.NET 5	Visual Studio 2019	Released
C# 8.0	September 2019	.NET Core 3.0	Visual Studio 2019	Released
C# 7.2	November 2017	Historic release	Visual Studio 2017	Released
C# 7.1	August 2017	Historic release	Visual Studio 2017	Released
C# 7.0	March 2017	Historic release	Visual Studio 2017	Released
C# 6.0	July 2015	Historic release	Visual Studio 2015	Released
C# 5.0	August 2012	Historic release	Visual Studio 2012	Released
C# 4.0	April 2010	Historic release	Visual Studio 2010	Released
C# 3.0	November 2007	Historic release	Visual Studio 2008	Released
C# 2.0	November 2005	Historic release	Visual Studio 2005	Released
C# 1.0	January 2002	Historic release	Visual Studio .NET 2002	Released

C# 15.0 (Preview, March 2026)

Release metadata: Official Microsoft Learn page date March 20, 2026, .NET 11 preview SDK, Visual Studio 2026 Insiders.

• Collection expression arguments
• Union types

C# 14.0 (November 2025)

Release metadata: Official Microsoft Learn page date November 18, 2025, .NET 10 SDK, Visual Studio 2026.

• Extension members
• Null-conditional assignment
• nameof supports unbound generic types
• Implicit Span and ReadOnlySpan conversions
• Lambda parameter modifiers
• Field-backed properties
• Partial events
• Partial constructors
• User-defined compound assignment operators
• File-based app directives

C# 13.0 (November 2024)

Release metadata: November 2024, .NET 9, Visual Studio 2022.

• Params collections
• Partial properties

C# 12.0 (November 2023)

Release metadata: November 2023, .NET 8, Visual Studio 2022.

• Primary constructors
• Collection expressions

C# 11.0 (November 2022)

Release metadata: November 2022, .NET 7, Visual Studio 2022.

• Raw string literals
• UTF-8 string literals
• Required members
• List patterns
• Generic attributes
• Generic math
• Unsigned right shift

C# 10.0 (November 2021)

Release metadata: November 2021, .NET 6, Visual Studio 2022.

• Global usings
• File-scoped namespaces
• Interpolated string handlers

C# 9.0 (November 2020)

Release metadata: November 2020, .NET 5, Visual Studio 2019.

• Records
• Init-only setters
• Target-typed new
• with expressions
• Top-level statements
• Relational patterns

C# 8.0 (September 2019)

Release metadata: September 2019, .NET Core 3.0, Visual Studio 2019.

• Switch expressions
• Nullable reference types
• Using declarations
• await using
• Index operator
• Range operator
• Null-coalescing assignment
• Property patterns
• Default interface methods
• Static local functions

C# 7.2 (November 2017)

• Span
• ref struct
• readonly struct

C# 7.1 (August 2017)

• async Main
• default literal

C# 7.0 (March 2017)

• Pattern matching
• Constant patterns
• Tuples
• Deconstruction
• Out variables
• Local functions
• Throw expressions
• Discards
• ref locals
• ref returns

C# 6.0 (July 2015)

• String interpolation
• nameof
• Null-conditional
• Expression-bodied members

C# 5.0 (August 2012)

• async/await

C# 4.0 (April 2010)

• Dynamic

C# 3.0 (November 2007)

• Lambda expressions
• LINQ query expressions
• Anonymous types
• Extension methods
• Auto-implemented properties
• var implicit typing

C# 2.0 (November 2005)

• Nullable value types
• Null-coalescing
• Iterator (yield)

C# 1.0 (January 2002)

• Attributes
• Indexers
• using statements
• Checked operators
• unsafe and fixed