C# / .NET News

This feed includes only recent releases, roughly from the last 12 months, not the full historical archive. That is why a long-established product may have only a few news items.

2 news

C# / .NET
.NET at Build 2026: union types in C#, .NET 11 preview, dotnetup

The announcement of union types in C# for modeling closed data sets (wire protocols, domain models) has been a long-standing developer request. .NET 11 focuses on performance and diagnostics; ASP.NET Core and Blazor get building blocks for agentic web apps (agents, tools, skills, components). A new dotnetup tool manages SDK/runtime versions.

Python has had typing.Union and sum-type patterns through the typing module for years; C# gets native union types only in .NET 11 Python →
C# / .NET
.NET 10 (LTS) is out: C# 14, Microsoft Agent Framework, JSON 20-40% faster

.NET 10 is an LTS release supported through November 10, 2028. C# 14 adds field-backed properties, extension properties, and first-class Span<T> conversions. The platform includes Microsoft Agent Framework, which combines Semantic Kernel and AutoGen to build AI agents with MCP and A2A out of the box.

Agent Framework supports MCP as a built-in protocol for agent communication MCP →

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