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Tag: dotnet

438 posts · Page 13 of 44

2026-08-05 errors dotnet dotnet-11

Fix: HTTP Error 500.30 - ASP.NET Core app failed to start after deploying to IIS

500.30 means your app threw during startup inside w3wp.exe. The real exception is already in the Windows Application event log under IIS AspNetCore Module V2. Read that first, then rank the fix: missing shared framework, x86/x64 app pool mismatch, missing config, or app pool permissions.

2026-08-05 dotnet csharp ai

Live Speech-to-Text in C# with Foundry Local: A 0.67 GB Model and No Cloud Call

The .NET blog shipped a live microphone transcription sample on August 4, 2026 using Foundry Local and nemotron-speech-streaming-en-0.6b. Here is the session API, the PCM backpressure trap, and which NuGet package to pick.

2026-08-04 dotnet nuget ci-cd

NuGet API Keys Get a 30-Day Cap on August 17, and Every Old Key Expires November 1

NuGet.org drops the 365-day API key option on August 17, 2026, caps new keys at 30 days, and expires every key created before that date on November 1. Here is what breaks and how to move a publish workflow to OIDC trusted publishing.

2026-08-03 agent-framework github-copilot ai-agents

Agent Framework's Copilot Provider Turns the Copilot CLI Into a Plain AIAgent

Microsoft.Agents.AI.GitHub.Copilot 1.16.0 shipped on July 30, 2026. The Copilot CLI runtime now sits behind the ordinary AIAgent abstraction, permissions are deny-by-default, and Squad plugs a whole agent team in as one AIAgent.

2026-08-03 csharp dotnet dotnet-11

How to validate options at startup with IValidateOptions<T> in .NET 11

Implement IValidateOptions<T>, register it in DI, and chain ValidateOnStart so a bad appsettings.json kills the process instead of the first request that touches it. Covers the .NET 11 Validate<TValidator>() overload, async validation through IAsyncValidateOptions<T>, and the three places ValidateOnStart silently does nothing.

2026-08-02 csharp dotnet dotnet-11

How to configure Kestrel to serve HTTP/3 in ASP.NET Core 11

A complete guide to enabling HTTP/3 on Kestrel in ASP.NET Core 11: the HttpProtocols.Http1AndHttp2AndHttp3 endpoint config, MsQuic platform requirements on Windows, Linux, and macOS, why the first request is never HTTP/3, how to verify with HttpClient and middleware, QuicTransportOptions tuning, and the firewall and proxy gotchas that make it silently fall back.

2026-08-02 csharp dotnet dotnet-11

How to replace new Regex(...) with the [GeneratedRegex] source generator in .NET 11

A complete guide to converting new Regex(pattern, RegexOptions.Compiled) into [GeneratedRegex] in .NET 11: the mechanical rewrite, partial methods vs partial properties, measured startup and throughput numbers, the SYSLIB1040-1045 diagnostics, and the two patterns where the generator silently falls back to a cached Regex.

2026-08-02 csharp dotnet dotnet-11

How to run CPU-bound work in a Blazor WebAssembly app with Web Workers in .NET 11

A complete guide to offloading CPU-bound work off the Blazor WebAssembly UI thread in .NET 11: why Task.Run does not help, the new blazorwebworker template, the WebWorkerClient API with cancellation and timeouts, the JSExport marshalling limits, and the second-runtime cost you pay per worker.

2026-08-02 visual-studio dotnet ai-agents

Visual Studio 18.8 Ships .NET Agent Skills Built In, Then Turns Them All Off

Visual Studio 2026 18.8 puts expert-authored .NET and Azure agent skills in the tool picker under a Built-in category, disabled by default. The default is the interesting part.

2026-08-01 dotnet ai-agents testing

The New .NET Unit-Test Agent's Best Idea Is Not Writing Tests

On 2026-07-31 Microsoft shipped a polyglot unit-test agent in dotnet/skills. The interesting part is the mandatory pre-completion gate that pseudo-mutates your assertions before the agent is allowed to say it is done.