What's the coolest thing coming in the next version of C#?

Name: What's the coolest thing coming in the next version of C#?
Uploaded: 2026-08-27T16:00:20.000Z
Channel: Microsoft Developer
Description: Mads Torgersen demonstrates C# 15's new union types feature, allowing developers to model closed sets of unrelated types with full strong typing and switch-based pattern matching. The feature arrives in November 2026 with preview compiler support in Visual Studio and VS Code. Ideal for .NET developers looking to adopt newer C# idioms.

Csharp Csharp 15 Dotnet Union Types Discriminated Unions Pattern Matching Mads Torgersen Visual Studio Vscode Preview Compiler Net Development

Microsoft Developer August 27, 2026

AI summary

Mads Torgersen demonstrates C# 15's new union types feature, allowing developers to model closed sets of unrelated types with full strong typing and switch-based pattern matching. The feature arrives in November 2026 with preview compiler support in Visual Studio and VS Code. Ideal for .NET developers looking to adopt newer C# idioms.