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.NET 11 RC1 ships with a go-live license; C# 15 stabilizes union types

.NET

Sep 10, 2026

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.NET 11 Release Candidate 1 is supported in production. C# 15 stabilizes unions and closed hierarchies, System.Text.Json adds union and closed-type polymorphism support, Half uses FP16 hardware instructions. GA lands at .NET Conf, November 10–12.