Daily C# Briefing — friday 02 october 2026

Bring your own AI model with updates to BYOM, fix NuGet vulnerabilities from the Error List, explore pull requests with the Git agent, see which operand decides an if condition, and attach to Podman containers. The post Visual Studio September Update – Power Your Workflow with Your Model appeared first on Visual Studio Blog.

Build Agentic UI with the new Blazor AI components for streamed content, tools, approvals, shared state, and generative experiences. The post Build Agentic UI with the new Blazor AI components appeared first on .NET Blog.

The new AG-UI .NET SDK enables .NET services to expose and consume interoperable agent endpoints using Microsoft.Extensions.AI. The post AG-UI Protocol now has a first-class .NET SDK appeared first on .NET Blog.

Starting September 23, 2026, Microsoft is updating the author-signing certificate used for NuGet packages. Customers using trusted signer policies or certificate fingerprint verification should add the new certificate as soon as possible. The post Microsoft is updating its author-signing certificate starting September 23, 2026 appeared first on .NET Blog.

We’ve all experienced this, the desktop application is hanging, the window is greyed out, and we’re just waiting for it to start to respond. Or we’re on a website and are sure that it was going to load faster than this, but we’re just waiting the loading icon spin around and around. These sorts of […] The post Today I will… debug a production crash appeared first on Visual Studio Blog.

Learn how to create a memory dump in C# to capture the state of your application for debugging purposes. The post Creating a memory dump in C# appeared first on .NET Blog.

I am building a complete C# agent live, from a single call around an IChatClient to a production-ready, observable, governed agent, using the Microsoft Agent Framework harness in a 4-part Microsoft Reactor series. The post Build Your Own AI Agent Harness in C#, the MafClaw Live Series appeared first on .NET Blog.

I am building a complete C# agent live, from a single call around an IChatClient to a production-ready, observable, governed agent, using the Microsoft Agent Framework harness in a 4-part Microsoft Reactor series. The post Build Your Own AI Agent Harness in C#, the MafClaw Live Series appeared first on .NET Blog.

AI is changing software development at a pace no one can ignore. Developers now have powerful AI tools that can help us write code, understand unfamiliar codebases, troubleshoot problems, learn new frameworks, and get answers in seconds. That is an incredible opportunity. But as these tools become more capable, I believe something else is becoming more valuable […] The post AI Is Changing How We Code. It’s Also Changing How We Learn. appeared first on Visual Studio Blog.

Today I want to look at how we can improve on the test coverage that we have in the Interview Coach application. This application has some unit tests in it already, but I’m sure there is room for improvement. Defining our baseline Before we start writing tests, it’s a good idea to have a baseline […] The post Today I will… improve test coverage appeared first on Visual Studio Blog.

Take a tour through hundreds of performance improvements in .NET 11. The post Performance Improvements in .NET 11 appeared first on .NET Blog.

Share how your team uses .NET to solve real problems and help us bring more community stories to .NET Conf 2026 and other .NET channels. The post Share your .NET story with the community appeared first on .NET Blog.

Learn how C# unions and closed hierarchies work with System.Text.Json across ASP.NET Core Minimal APIs, MVC, SignalR, Blazor, and OpenAPI. The post Use C# unions and closed hierarchies in ASP.NET Core appeared first on .NET Blog.

Learn how C# unions and closed hierarchies work with System.Text.Json across ASP.NET Core Minimal APIs, MVC, SignalR, Blazor, and OpenAPI. The post Use C# unions and closed hierarchies in ASP.NET Core appeared first on .NET Blog.

.NET 11 Release Candidate 1 is available with improvements across libraries, runtime, SDK, MSBuild, NuGet, C#, F#, ASP.NET Core, .NET MAUI, and Windows Forms. The post Announcing .NET 11 Release Candidate 1 appeared first on .NET Blog.

.NET 11 Release Candidate 1 is available with improvements across libraries, runtime, SDK, MSBuild, NuGet, C#, F#, ASP.NET Core, .NET MAUI, and Windows Forms. The post Announcing .NET 11 Release Candidate 1 appeared first on .NET Blog.

Submit your session proposal for the community-led .NET Conf 2026 Community Days by October 6, 2026. The post .NET Conf 2026 Community Days Call for Presenters Is Open appeared first on .NET Blog.

When a distributed application feels slow, the user sees one delay. The code behind that delay may run across a web frontend, backend services, databases, and external APIs. If you profile only the frontend while the backend is slow, the profiler can show that the frontend is healthy without revealing the actual bottleneck. This article […] The post Today I will… find hidden latency across a distributed .NET application appeared first on Visual Studio Blog.

A user asked for per-solution color themes. It already ships, and it goes further than they asked. You run several instances of Visual Studio side by side, one per solution, and they all look identical. Same taskbar icon, same alt-tab thumbnail, same chrome. So, you land in the wrong one, start typing, and realize thirty […] The post Stop alt-tabbing into the wrong Visual Studio appeared first on Visual Studio Blog.

Today I will show you how we can tackle one of the most common tasks when working in a development team or managing an open-source project, and that is working with Pull Requests. While we’re going to be using the GitHub tooling within Visual Studio for this, the approach would be very similar with Azure […] The post Today I will… review GitHub PRs appeared first on Visual Studio Blog.