--- title: Beyond Boundaries Is Getting a Major Update for .NET 11... description: An author announces a major revision of his networking-focused C#/.NET book, expanding from 17 to 19 chapters with over 200 new pages, targeted at the .NET 11... canonical: https://daily.dev/posts/beyond-boundaries-is-getting-a-major-update-for-net-11-and-c-15---chris-woody-woodruff-lau5nx33u twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Beyond Boundaries Is Getting a Major Update for .NET 11 and C# 15 - Chris Woody Woodruff | daily.dev og:description: An author announces a major revision of his networking-focused C#/.NET book, expanding from 17 to 19 chapters with over 200 new pages, targeted at the .NET 11... og:url: https://daily.dev/posts/beyond-boundaries-is-getting-a-major-update-for-net-11-and-c-15---chris-woody-woodruff-lau5nx33u og:image: https://api.daily.dev/og/posts/lAu5NX33U.png og:image:alt: Beyond Boundaries Is Getting a Major Update for .NET 11 and C# 15 - Chris Woody Woodruff og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Beyond Boundaries Is Getting a Major Update for .NET 11 and C# 15 - Chris Woody Woodruff **[We Are .NET](https://daily.dev/sources/wearedotnet)** · 4 min read · 19 upvotes · 0 comments ## Summary An author announces a major revision of his networking-focused C#/.NET book, expanding from 17 to 19 chapters with over 200 new pages, targeted at the .NET 11 GA release in November and C# 15. New chapters cover network security and modern authentication (TLS 1.3 diagnostics, post-quantum crypto prep, passkeys/WebAuthn, OAuth2/OIDC, zero trust) and building cloud-native apps with .NET Aspire. Existing chapters get updates for Runtime Async, Polly v8 resilience, System.Text.Json streaming improvements, Native AOT, HttpClientFactory, gRPC JSON transcoding, SignalR auth refresh, and HTTP/3 stream prioritization. MCP server tooling and Blazor-specific features are explicitly out of scope. The update will ship on LeanPub, free to existing purchasers. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Questions this post answers ### What is Runtime Async in .NET 11 and how does it change async debugging? Runtime Async in .NET 11 moves async state machines from the compiler into the runtime itself, producing cleaner stack traces (reducing something like 13 frames down to 5), better debuggability, lower overhead, and JIT-level optimizations such as factory intrinsics and ExecutionContext capture elimination. It represents one of the most significant changes to async network code in .NET 11. _Track runtime-level async changes like this on daily.dev before they hit your production code._ ### What new authentication and security APIs does .NET 11 add for networking? .NET 11 adds ITlsHandshakeFeature.Exception for diagnosing TLS handshake failures, UseTlsClientHelloListener for ClientHello inspection, an X25519DiffieHellman class for hybrid key exchange supporting post-quantum cryptography prep, AAGUID-based display name inference for passkeys/WebAuthn, default CSRF protection, and cross-stack IAuthorizationRequirementData support spanning REST, SignalR, and Blazor for zero trust networking. _Developers hardening .NET networking code can follow security API changes like these on daily.dev._ ### Does .NET 11 still require the OpenTelemetry.Instrumentation.AspNetCore package for ASP.NET Core tracing? No, .NET 11 includes native ASP.NET Core tracing built into the runtime, so the separate OpenTelemetry.Instrumentation.AspNetCore package is no longer required for observability in ASP.NET Core applications, simplifying Aspire and cloud-native application setups. _Teams adopting Aspire and OpenTelemetry can watch dependency changes like this via daily.dev._ ## Similar posts on daily.dev - [Microsoft Releases .NET 11 Preview 6 With Language and Framework Updates](https://daily.dev/posts/microsoft-releases-net-11-preview-6-with-language-and-framework-updates-oqwjdzv3l) · InfoQ · 6 upvotes · 0 comments - [.NET train keeps rolling with first showing of 2026 release](https://daily.dev/posts/net-train-keeps-rolling-with-first-showing-of-2026-release-i497xhbps) · DEVCLASS · 17 upvotes · 0 comments - [.NET 10: What’s New for Authentication and Authorization](https://daily.dev/posts/net-10-what-s-new-for-authentication-and-authorization-0mnjaiuqi) · Auth0 · 82 upvotes · 0 comments - [.NET 5 to 10: Key Features Introduced in Every Release](https://daily.dev/posts/net-5-to-10-key-features-introduced-in-every-release-nb2ddspjl) · We Are .NET · 8 upvotes · 0 comments --- Tags: [#.net](https://daily.dev/tags/.net), [#c#](https://daily.dev/tags/c#) [View this post on daily.dev](https://daily.dev/posts/beyond-boundaries-is-getting-a-major-update-for-net-11-and-c-15---chris-woody-woodruff-lau5nx33u) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"Beyond Boundaries Is Getting a Major Update for .NET 11 and C# 15 - Chris Woody Woodruff","url":"https://daily.dev/posts/beyond-boundaries-is-getting-a-major-update-for-net-11-and-c-15---chris-woody-woodruff-lau5nx33u","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/beyond-boundaries-is-getting-a-major-update-for-net-11-and-c-15---chris-woody-woodruff-lau5nx33u"},"datePublished":"2026-08-21T16:57:12.841Z","dateModified":"2026-09-14T06:19:20.979Z","description":"An author announces a major revision of his networking-focused C#/.NET book, expanding from 17 to 19 chapters with over 200 new pages, targeted at the .NET 11...","image":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/185e5d17e3ade59583623fed776a25a9?_a=AQAEuop","thumbnailUrl":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/185e5d17e3ade59583623fed776a25a9?_a=AQAEuop","isAccessibleForFree":true,"articleSection":"We Are .NET","inLanguage":"en","publisher":{"@type":"Organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180}},"author":{"@type":"Organization","name":"We Are .NET","logo":"https://media.daily.dev/image/upload/s--BsnVOa3i--/f_auto/v1718347410/logos/wearedotnet","url":"https://daily.dev/sources/wearedotnet"},"commentCount":0,"discussionUrl":"https://daily.dev/posts/beyond-boundaries-is-getting-a-major-update-for-net-11-and-c-15---chris-woody-woodruff-lau5nx33u","interactionStatistic":[{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":19},{"@type":"InteractionCounter","interactionType":{"@type":"CommentAction"},"userInteractionCount":0}],"keywords":".net,c#","timeRequired":"PT4M"} {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"We Are .NET","item":"https://daily.dev/sources/wearedotnet"},{"@type":"ListItem","position":3,"name":"Beyond Boundaries Is Getting a Major Update for .NET 11 and C# 15 - Chris Woody Woodruff"}]} {"@context":"https://schema.org","@type":"FAQPage","@id":"https://daily.dev/posts/beyond-boundaries-is-getting-a-major-update-for-net-11-and-c-15---chris-woody-woodruff-lau5nx33u#faq","mainEntity":[{"@type":"Question","name":"What is Runtime Async in .NET 11 and how does it change async debugging?","acceptedAnswer":{"@type":"Answer","text":"Runtime Async in .NET 11 moves async state machines from the compiler into the runtime itself, producing cleaner stack traces (reducing something like 13 frames down to 5), better debuggability, lower overhead, and JIT-level optimizations such as factory intrinsics and ExecutionContext capture elimination. It represents one of the most significant changes to async network code in .NET 11. Track runtime-level async changes like this on daily.dev before they hit your production code."}},{"@type":"Question","name":"What new authentication and security APIs does .NET 11 add for networking?","acceptedAnswer":{"@type":"Answer","text":".NET 11 adds ITlsHandshakeFeature.Exception for diagnosing TLS handshake failures, UseTlsClientHelloListener for ClientHello inspection, an X25519DiffieHellman class for hybrid key exchange supporting post-quantum cryptography prep, AAGUID-based display name inference for passkeys/WebAuthn, default CSRF protection, and cross-stack IAuthorizationRequirementData support spanning REST, SignalR, and Blazor for zero trust networking. Developers hardening .NET networking code can follow security API changes like these on daily.dev."}},{"@type":"Question","name":"Does .NET 11 still require the OpenTelemetry.Instrumentation.AspNetCore package for ASP.NET Core tracing?","acceptedAnswer":{"@type":"Answer","text":"No, .NET 11 includes native ASP.NET Core tracing built into the runtime, so the separate OpenTelemetry.Instrumentation.AspNetCore package is no longer required for observability in ASP.NET Core applications, simplifying Aspire and cloud-native application setups. Teams adopting Aspire and OpenTelemetry can watch dependency changes like this via daily.dev."}}]} ```