.NET Evolution: Version by Version

.NET Evolution: Version by Version

.NET Framework Era (2002–2019)

.NET Framework 1.0 (2002)

The original release. Introduced the CLR, BCL, ASP.NET WebForms, WinForms, ADO.NET, and C# 1.0.

.NET Framework 2.0 (2005)

• Generics (List<T>, Dictionary<K,V>)
• Nullable types (int?)
• Iterators (yield return)
• Anonymous methods
• ASP.NET 2.0 with master pages

.NET Framework 3.0 (2006)

• WPF (Windows Presentation Foundation)
• WCF (Windows Communication Foundation)
• WF (Windows Workflow Foundation)
• CardSpace

.NET Framework 3.5 (2007)

• LINQ (Language Integrated Query)
• Extension methods
• Lambda expressions
• Anonymous types
• var keyword
• ASP.NET AJAX, MVC preview

.NET Framework 4.0 (2010)

• Task Parallel Library (TPL)
• PLINQ
• dynamic keyword
• Named/optional parameters
• MEF (Managed Extensibility Framework)
• Entity Framework 4

.NET Framework 4.5 (2012)

• async/await (C# 5.0)
• Caller info attributes
• ASP.NET MVC 4, Web API
• Portable Class Libraries

.NET Framework 4.6–4.7 (2015–2017)

• RyuJIT compiler (64-bit)
• .NET Native
• Improved GC
• TLS 1.2 support

.NET Framework 4.8 / 4.8.1 (2019/2022)

• Final version of .NET Framework
• High DPI improvements, accessibility fixes
• 4.8.1 added ARM64 support
• Still ships with Windows; no new features planned

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.NET Core Era (2016–2019)

.NET Core 1.0 (2016)

• Cross-platform (Windows, Linux, macOS)
• Open source
• Modular NuGet-based runtime
• ASP.NET Core 1.0 (Kestrel, Middleware pipeline)
• CLI tooling (dotnet command)

.NET Core 1.1 (2016)

• Performance improvements
• More Linux distro support
• Additional APIs

.NET Core 2.0 (2017)

• .NET Standard 2.0 — massive API surface increase (32k+ APIs)
• Razor Pages
• Span<T> preview
• SignalR for ASP.NET Core

.NET Core 2.1 (2018) — LTS

• Span<T> and Memory<T> GA
• HttpClientFactory
• Generic Host
• SignalR GA
• Blazor preview

.NET Core 2.2 (2018)

• In-process hosting for IIS
• Health checks
• HTTP/2 in Kestrel

.NET Core 3.0 (2019)

• WinForms and WPF on .NET Core (Windows only)
• Blazor Server GA
• Worker Services
• gRPC support
• C# 8.0 (nullable reference types, async streams, switch expressions)
• System.Text.Json (built-in JSON)

.NET Core 3.1 (2019) — LTS

• Blazor Server improvements
• C# 8.0 refinements
• Last LTS before the unified platform

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Unified .NET Era (2020–present)

.NET 5 (2020)

• Unified platform — merges .NET Core, Mono, Xamarin
• Single BCL across all platforms
• C# 9.0: records, init-only setters, top-level statements, pattern matching improvements
• F# 5.0
• Single-file applications
• ARM64 support
• System.Text.Json improvements

.NET 6 (2021) — LTS

• Minimal APIs
• Hot Reload
• C# 10: global usings, file-scoped namespaces, record structs
• MAUI preview (cross-platform UI)
• DateOnly / TimeOnly types
• PriorityQueue
• Parallel.ForEachAsync
• HTTP/3 preview
• Blazor improvements (Blazor WebAssembly AOT)

.NET 7 (2022)

• Native AOT (Ahead-of-Time compilation) preview
• Rate limiting middleware
• Output caching
• C# 11: required members, raw string literals, list patterns, generic math
• gRPC JSON transcoding
• INumber<T> generic math interfaces
• Regex source generators
• Microsecond/nanosecond in DateTime

.NET 8 (2023) — LTS

• Native AOT GA for ASP.NET Core
• Blazor United (Server + WASM in one app)
• Keyed DI services
• FrozenDictionary / FrozenSet
• C# 12: primary constructors, collection expressions, inline arrays, using aliases for any type
• TimeProvider abstraction (testable time)
• Metrics API improvements
• System.Text.Json source gen improvements
• MAUI GA improvements

.NET 9 (2024)

• SearchValues<T> for high-performance search
• OrderedDictionary<K,V>
• LINQ: CountBy, AggregateBy, Index
• Tensor<T> for AI/ML workloads
• C# 13: params collections, lock object, \e escape sequence
• Blazor: static SSR, streaming rendering
• ASP.NET Core: OpenAPI built-in, HybridCache
• Runtime: loop alignment, stack allocation improvements
• BinaryFormatter removed

.NET 10 (2025) — LTS

• C# 14: field keyword in properties, nameof for unbound generics, params in lambdas
• System.Threading.Channels improvements
• ZipArchive async support
• Blazor: enhanced form handling, improved SSR
• ASP.NET Core: OpenAPI 3.1 support, improved minimal API filters
• EF Core 10: Azure Cosmos DB improvements, complex type collections
• MAUI: performance and platform parity improvements
• NativeAOT: broader API compatibility

.NET 11 (2026) — Expected

• C# 15 features (in development)
• Further Native AOT expansion
• AI/ML integration improvements (Microsoft.Extensions.AI)
• Continued Blazor unification
• Performance: GC improvements, JIT enhancements
• System.Numerics and tensor improvements for AI workloads
• Enhanced observability (OpenTelemetry integration)

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LTS vs STS Release Cadence

Type	Support	Examples
LTS (Long Term Support)	3 years	.NET 6, 8, 10
STS (Standard Term Support)	18 months	.NET 5, 7, 9

Even-numbered releases are LTS. Releases ship every November.

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Key Milestones Summary

Milestone	Version
Cross-platform born	.NET Core 1.0
LINQ introduced	.NET Framework 3.5
async/await	.NET Framework 4.5
Unified platform	.NET 5
Minimal APIs	.NET 6
Native AOT GA	.NET 8
AI/ML tensor support	.NET 9