21CTO

Feb 17, 2026 · Backend Development

What’s New in .NET 11 Preview and C# 15? Key Features and Runtime Changes

Microsoft’s .NET 11 preview introduces two‑year STS support, reduces reliance on the Mono runtime, promotes CoreCLR for WebAssembly and Android, adds Zstandard compression, and unveils C# 15 collection‑expression arguments, offering developers early access to significant performance and language enhancements.