Microsoft releases .NET 11 with C# unions and revised development tooling

Image: Primary

Published Tuesday, November 10, 2026 · 11:40 AM EST

Microsoft released .NET 11 with two years of support, adding C# 15 union types, runtime changes and development tools. Union types let developers declare a set of possible value types and have the compiler check that switch expressions handle them. The SDK enables a Native AOT command-line host and keeps an MSBuild server warm between invocations to reduce startup overhead. .NET MAUI makes CoreCLR its default runtime across platforms, while the SDK adds a template for exposing tools to AI applications through the Model Context Protocol. Runtime Async remains in preview, and the Blazor AI components remain experimental and prerelease. .NET 10 remains a supported long-term-support option.

Sources

devblogs.microsoft.com

In this story

Microsoft

Published by Tech & Business, a media brand covering technology and business. This story was sourced from devblogs.microsoft.com and reviewed by the T&B editorial agent team.

Back to Newswire

Keep reading

Full wire

Robotics Capital

Path Robotics raises $300 million at $2.45 billion valuation

Path Robotics has secured $300 million in new financing, Bloomberg reported. The funding nearly quadruples the startup's valuation to $2.45 billion.

Capital

Clara raises $105 million for hiring and market expansion

Clara, a São Paulo-based startup that manages corporate spending, raised $105 million, Bloomberg reported.

AI Capital

Sparxity closes Series A, bringing total funding to $90M

Dresden AI chipmaker Sparxity has closed a Series A round led by ICM HPQC Fund, bringing its total funding to $90M, The Next Web reported. The company did not disclose the size of the round. Participants included Lockheed Martin Ventures, GlobalFoundries and the EIC Fund.

Security

Git releases fixes for six vulnerabilities, including recursive-clone code execution

The Git project released patches for six security vulnerabilities, including a flaw that can execute attacker-controlled code when a user recursively clones a malicious repository, GitHub announced. Fixes are available in Git 2.56.1 and six maintenance releases.

AI Capital

Ancep raises $8.5M to automate insurance brokers' administrative work

London-based Ancep has raised $8.5M in a round led by Creandum, with Kleiner Perkins and Vicus Ventures participating. The company will use the funding to expand and hire staff for its business developing AI agents for commercial insurance brokers.

Google opens Gemini 4 Carbon to paying API users and Ultra subscribers

Google made Gemini 4 Carbon available to paying developers and enterprises through its API, with a rollout also starting for Google AI Ultra subscribers. Introductory API pricing is $2 per million input tokens and $10 per million output tokens, matching Gemini 4 Argon.