Announcing .NET 11 Release Candidate 2
<p>.NET 11 Release Candidate 2 is available with improvements across libraries, runtime, SDK, MSBuild, NuGet, F#, ASP.NET Core, .NET MAUI, and Windows Forms.</p> <p>The post <a href="https://devblogs.microsoft.com/dotnet/dotnet-11-rc-2/">Announcing .NET 11 Release Candidate 2</a> appeared first on <a href="https://devblogs.microsoft.com/dotnet">.NET Blog</a>.</p>
Collection Expression Arguments Fix the Comparer Problem in C# 15
C# 15 adds with(...) arguments to collection expressions, so you can finally set a comparer or capacity without abandoning the [a, b] syntax.
Swap System.Text.Json for REDox in a Minimal API
Plug the REDox serializer into an ASP.NET Core Minimal API in place of System.Text.Json, then benchmark both to see if the throughput win is real.
.NET and .NET Framework October 2026 servicing releases updates
<p>A recap of the latest servicing updates for .NET and .NET Framework for October 2026.</p> <p>The post <a href="https://devblogs.microsoft.com/dotnet/dotnet-and-dotnet-framework-october-2026-servicing-updates/">.NET and .NET Framework October 2026 servicing releases updates</a> appeared first on <a href="https://devblogs.microsoft.com/dotnet">.NET Blog</a>.</p>
Durable Task in the Real World: What Problems Does It Actually Solve?
<p>Five practical examples of when durable execution makes sense, when it does not, and what it means for AI agents.</p> <p>The post <a href="https://devblogs.microsoft.com/dotnet/durable-task-in-the-real-world/">Durable Task in the Real World: What Problems Does It Actually Solve?</a> appeared first on <a href="https://devblogs.microsoft.com/dotnet">.NET Blog</a>.</p>
C# 15 Union Types: Build Serializable Workflows
Build a C# 15 union workflow on .NET 11: one Next method, typed inputs, exhaustive results, and JSON state you can save and rehydrate.
Directory.Build.props: Share Settings Across .NET Projects
Directory.Build.props shares MSBuild properties like Nullable and LangVersion across every .NET project in a solution, including nested overrides.
.NET Data Community Standup: Teach your AI agent database design with T-SQL static code analysis
Erik will show two ways you can take advantage of the open-source set of T-SQL static analysis rules, and the surrounding set of tools, that he maintains. First, you can get live code analysis of your SQL scripts as you type them in VS Code, Visual Studio and SQL Server Management Studio. Secondly, in companionship with EF Core Power Tools, you can build your database model (and EF Core model) with AI and guide it by enforcing the more than 140 rules in the package. 🎙️ Featuring: Jiri Cincura, Erik Ejlskov Jensen #net #data #efcore #tsql #vs #vscode #ssms
.NET AI Community Standup: Build agentic experiences with the Blazor AI Components
Modern AI applications can be more than chat. Join Bruno Capuano and Daniel Roth to explore how the new Blazor AI Components bring agentic experiences to .NET apps. We'll look at how agents can participate in user workflows, stream structured responses, invoke tools, request approvals, and collaborate through shared state. See how Blazor's component model helps render these interactions and build responsive, user-controlled experiences. 🔗 Links: https://www.theurlist.com/blazor-standup 🎙️ Featuring: Bruno Capuano (@elbruno), Daniel Roth (@danroth27) #AI #Blazor #DotNet
Beyond hooks: enriching live sessions with undocumented transcript logs
How HarnessSpy combines authoritative hooks with undocumented Cursor, Claude Code and Copilot CLI transcript logs to group interactions, bind tools and MCP calls, and add reasoning, lifecycle, usage and cost without duplicate timelines or summaries.
BOLA in ASP.NET Core: Why Authenticated Users Can Still Read Someone Else's Data
Broken Object Level Authorization (BOLA) is OWASP's #1 API security risk, and [Authorize] does nothing to stop it: it confirms who the caller is, not whether they should see the object behind this specific ID. Here's how BOLA shows up in ASP.NET Core APIs, why EF Core global query filters aren't a full fix on their own, and how to close it with resource-based authorization and a test matrix that catches the regression before a pentest does.
Microsoft just changed how developers will work forever
The new Surface Ultra comes with a huge focus on local AI and "Hybrid Intelligence" - but what will the experience with local AI for coding be like? 0:00 Microsoft announces Hybrid Intelligence in Surface Ultra 0:22 MAI-Code-1.1-Flash for .NET developers! 1:00 Keynote recap 1:30 Where are the weights for MAI-Code-1.1-Flash? 2:09 Azure Foundry still doesn't support local deployments of LLMs 3:27 Running Qwen3.8-Flash-Next on Unsloth Desktop 4:46 Using the local LLM with GitHub Copilot app 6:29 Checking out the results of the agent 7:35 Closing #coding #dotnet #githubcopilot
Blazor Community Standup: Build agentic experiences with the Blazor AI Components
Modern AI applications are more than chat experiences. Learn how to use the new Blazor AI Components to build agent-centric apps where AI agents actively participate in the user experience, driving workflows, taking actions, and helping users get work done. ⌚ Chapters: 00:00 Countdown 02:30 Intro & Welcome 03:36 .NET Community updates 04:57 On today's stream - Intro to Agentic AI in .NET 11:46 Architecting Agentic web apps 14:40 Official AG-UI .NET SDK release 21:37 Building agentic experiences with Blazor AI components 22:47 Demo setup & Aspire overview 26:10 First agentic chat demo 29:10 Handling rich text & UI formatting 36:15 Front-end tools demo 38:37 Human-in-the-loop / Tool approval demo 44:25 Shared state & collaborative editing 51:30 Agentic generative UI / Trip planner demo 57:00 Predictive state / Story generation demo 59:00 Agent reasoning & activity blocks 1:03:08 Blazor Hybrid for desktop & closing 🔗 Links: https://www.theurlist.com/blazor-standup-20261006 🎙️ Featuring: Daniel Roth, Jon Galloway #dotnet #aspnetcore #blazor
A faster, lighter C# Dev Kit
<p>C# Dev Kit has been rebuilt to open solutions in about a second and run on a fraction of the memory, and this post walks through what changed for you.</p> <p>The post <a href="https://devblogs.microsoft.com/dotnet/faster-lighter-csharp-dev-kit/">A faster, lighter C# Dev Kit</a> appeared first on <a href="https://devblogs.microsoft.com/dotnet">.NET Blog</a>.</p>
Learning Less Since Claude Code? Watch This
🤖 Learn how to take the best out of Claude Code with me: https://dometrain.com/course/getting-started-claude-code/?ref=gui-ferreira&promo=youtube&promotion=youtube You write a prompt and the thing gets implemented. It works, it ships. But the struggle of building it is where ideas used to become knowledge, and that part quietly went missing. It's not only a junior problem. New stack, new domain, new team, new codebase. Every time you're new to something, a good coding agent can take the learning away along with the work. Claude Code has a setting for this that most people never open. #claudecode #claude #ai #aiengineering
Stripping extra dependencies in .NET NativeAOT apps using linker substitutions
In this post I describe how to perform method-substitutions with the NativeAOT linker to remove additional dependencies that the linker couldn't see were unused
UWP and WinUI 3 apps: UI testing with MSTest
<p>Learn how to test UWP and WinUI 3 apps with MSTest and Microsoft.Testing.Platform across packaged, unpackaged, and AppContainer hosts.</p> <p>The post <a href="https://devblogs.microsoft.com/dotnet/testing-uwp-and-winui-3-apps-with-mstest/">UWP and WinUI 3 apps: UI testing with MSTest</a> appeared first on <a href="https://devblogs.microsoft.com/dotnet">.NET Blog</a>.</p>
Convert a String to an Int in C#
Three reliable ways to convert a string to an int in C# — int.Parse, int.TryParse, and Convert.ToInt32 — plus which one to reach for and why.
Rails to ASP.NET Core: A Developer's Map
Map Rails conventions, Hotwire, Active Record, and Sidekiq to ASP.NET Core, EF Core, htmx, Blazor, Hangfire, and more.