.NET 11 Release

Discover .NET 11: native async, the long-awaited Union types, and maximum speed!

On November 10, 2026, the development world received another major update — .NET 11 was officially released alongside C# 15. And the best news of all: it’s already available for deploying your projects on our hosting platform!

If you thought that after last year’s milestone .NET 10 release, Microsoft’s developers would have nothing left to surprise us with, this version proves otherwise. It reimagines fundamental aspects that the community has been waiting for years — from how async/await works “under the hood” to how C# handles types. Let’s take a look, without any boring manuals, at exactly what’s new in this release, who should upgrade right away, and what interesting features the developers have hidden away. As always, check the developers’ official websites for more detailed information.

Game-changing key features

1. Runtime Async: async/await has been moved to the “core”

For more than ten years, async/await in C# worked thanks to the magic of the compiler, which transformed your elegant code into a complex state machine. In .NET 11, asynchrony has become a native feature of the runtime itself (Runtime Async V2).

• What does this mean in practice? Fewer memory allocations, faster execution, and better optimization thanks to JIT and NativeAOT.
• A debugging bonus. Stack traces when asynchronous code crashes are finally clean and readable, without dozens of compiler-generated lines.

2. C# 15: Union Types We've Been Waiting for Forever

C# 15 finally introduced full-fledged union types and closed class hierarchies.

• Now you can write `public union Result(Success, Failure);`, and the compiler will strictly ensure that you handle absolutely all possible cases in a `switch` statement. No more accidental `default => throw new Exception()` statements that go off in production on a Friday night.
• Other welcome new features in C# 15: labels for break and continue (you can finally exit a nested loop without workarounds using flag variables), indexing in extension blocks (you can add access via [ ] even to a regular IEnumerable), and passing constructor arguments directly to collections via with(...).

3. Web and ASP.NET Core 11: Zstandard Compression and Built-in Security

Web developers now have tools that immediately help them save on bandwidth, server resources, and stress:

• Built-in Zstandard (zstd). ASP.NET Core 11 added support for the modern Zstandard compression algorithm directly to the standard providers. It is faster and compresses data more effectively than the familiar Gzip, which instantly reduces network load and speeds up API performance.
• Asynchronous Validation in Minimal APIs. Now you can validate data (for example, to check whether an email address is already taken in the database) asynchronously during the model validation phase, without overloading the request handler itself.
• Automatic CSRF protection, OpenAPI 3.2, and native support for OpenTelemetry. Basic tracing and metrics now work “out of the box,” without the need to install numerous third-party NuGet packages.
• The [ShortCircuit] attribute. It allows you to return a response instantly (for example, for robots.txt), bypassing the entire chain of unnecessary intermediate modules.

4. Databases and AI: EF Core 11 and Vector Search

If you're developing services that use artificial intelligence or complex analytical queries, you should definitely install this update.

• Vector Search in EF Core 11. Native support for vector distances and indexes for SQL Server has been introduced (currently as an experimental API) — making it significantly easier to build RAG systems and implement semantic search.
• A Full Outer Join. LINQ now includes a `FullJoin` method, which EF Core correctly converts to SQL.
• Quantum Cryptography and ML Types. Post-quantum cryptographic APIs (ML-KEM / HPKE, currently in “preview” status) and BFloat16 floating-point types for machine learning tasks have been added to the standard library.

5. A faster SDK and smaller containers

• NativeAOT CLI. The `dotnet` utility now runs natively via AOT, so commands in the terminal are executed instantly, without having to load a virtual machine first.
• Lightweight Docker images. Thanks to deduplication and hard links, the size of SDK container images has been reduced by 17%, which speeds up CI/CD and deployment to hosting providers.

Technical Cheat Sheet: Stability, Hardware, and Support Period

An interesting paradox of the product lifecycle: thanks to Microsoft’s updated policy, support for STS versions now lasts 24 months instead of the previous 18. As a result, the lifecycles of last year’s .NET 10 (LTS) (through November 14, 2028) and the new .NET 11 (STS) (through November 9, 2028) will end at nearly the same time.

Therefore, by choosing .NET 11 today, you get the same two years of reliable support, but with a much more powerful set of tools. However, owners of projects built on .NET 8 and .NET 9 should act quickly — official support for both of these versions ends on November 10, 2026.

A little humor and behind-the-scenes moments from the release

The development of .NET 11 wasn't without a bit of self-deprecating humor from Microsoft engineers and the community.

• The Magic of the Number 11. While the release was being prepared, an overview of the new features titled “Top 11 .NET 11 Features in 11 Minutes and 11 Seconds!!11!” went viral in the community — the creators actually timed the video to align with the magic number 11.
• An Ode to Retired Skeletons. Commenting on the introduction of Union types in C# 15, the developers joked: “We had to wait until an era when artificial intelligence promises to completely replace programmers for C# to finally get the standard Union types we’ve been asking for since 2015.”
• “Barry” vs. nested loops. In the official documentation examples and demo videos, the developers tested the new labeled break feature by naming the outer loop simply “barry” — which is why the statement `break barry;` appeared quite legitimately in C# 15 code, sounding more like a threat to a colleague than a flow-control statement.
• Goodbye, the age of dinosaurs. The .NET 11 runtime now includes a strict check for the minimum processor instructions (x86-64-v2) at startup. As some joked in the pull requests: if your server dates back to the time the first iPhone was released, .NET 11 will politely refuse to run on it, so you don’t end up torturing yourself or your hardware.

What is .NET 11 best suited for?

Give it a try right now!

You don't need to spend time configuring servers or manually installing the latest SDK versions. Support for .NET 11 is already available in our hosting control panel.

Just create a new application or change the target framework in your site's settings to net11.0 — and experience the speed of this next-generation platform in action!