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Add evergreen conceptual article for Runtime Async in .NET 11 - #56518

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SkyDevLab:docs/56107-runtime-async
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SkyDevLab wants to merge 1 commit into
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SkyDevLab:docs/56107-runtime-async

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@SkyDevLab SkyDevLab commented Oct 21, 2026 •

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Adds an evergreen conceptual article on Runtime Async (Runtime Async V2) in .NET 11 under asynchronous programming, and cross-links it from the .NET 11 runtime What's New documentation.

Fixes #56107


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docs/core/whats-new/dotnet-11/runtime.md Learn preview
docs/csharp/asynchronous-programming/runtime-async.md Learn preview
docs/csharp/toc.yml Learn preview

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🔵 Needs a closer look

Preview-runtime configuration and optimization claims still warrant runtime-maintainer validation before publication.

1 open issue
What changed in this PR

Adds evergreen Runtime Async guidance to the C# asynchronous programming documentation, making the .NET 11 feature discoverable beyond release notes.

Changes:

  • Adds a conceptual article covering configuration, execution behavior, debugging, compilation support, and performance.
  • Adds an asynchronous programming TOC entry.
  • Links the .NET 11 runtime release summary to the new article.
File Description
docs/​csharp/​toc.yml Adds navigation to Runtime Async guidance.
docs/​csharp/​asynchronous-programming/​runtime-async.md Introduces the evergreen conceptual article.
docs/​core/​whats-new/​dotnet-11/​runtime.md Links the release summary to detailed guidance.

Review effort: Balanced

```

> [!NOTE]
> Exception stack traces (captured via `catch (Exception ex)`) already appeared clean in earlier .NET versions because <xref:System.Runtime.ExceptionServices.ExceptionDispatchInfo> pruned compiler state machine frames. Runtime Async brings that same clarity to live thread inspection, profilers, and debuggers.
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[New article]: Runtime async in .NET 11

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