ASP.NET Reliability, AI Agents, and JSON

Software Architecture in .NET C#: Shaping applications that survive change

Medium

Every application has an architecture. The only question is whether someone chose it, or whether it simply happened, one urgent feature at…

Topics: Clean Architecture C#

Your AI coding agent can leak one customer’s data to another — and every test will still pass

Medium

I built TenantLint, an open-source Roslyn analyzer that catches cross-tenant data leaks in .NET at build time: in your IDE, in CI, and…

Topics: Roslyn Security

How to Add Health Checks to an ASP.NET Core Application

C# Corner

Learn to add ASP.NET Core health checks, verify SQL Server connectivity, and expose separate liveness and readiness endpoints for production monitoring.

Topics: ASP.NET Core SQL Server

What's new across Microsoft SQL at SQLCon/FabCon Europe 2026

Microsoft Dev Blogs - Anna Hoffman

Live From Barcelona Woo! I’m posting this live from the first ever European SQLCon (joint conference with FabCon EU), and the second ever SQLCon. The energy here is great, as the community comes toget...

Topics: Azure SQL Server

Two C# Objects, One Database Row: The Hidden Identity Map Inside EF Core

Medium

Why Entity Framework Core refuses to track duplicate entities, what InternalEntityEntry actually does, and the design decisions hiding…

Topics: EF Core

React 19.3 Fragment Refs: How to Work With Multiple DOM Elements

C# Corner - Riya Patel

How to Use CancellationToken in ASP.NET Core Without Leaving Work Running

C# Corner

Learn how to use CancellationToken in ASP.NET Core to stop unnecessary work when requests are aborted, including cancellation in EF Core queries and HttpClient calls.

Topics: ASP.NET Core EF Core

How to Keep Customer Data Separate in a Multi-Tenant ASP.NET Core App

C# Corner

Learn how to isolate tenant data in an ASP.NET Core shared-database application using EF Core query filters, tenant claims, safe writes, and authorization.

Topics: ASP.NET Core Authorization EF Core

How to Add API Versioning to an ASP.NET Core Web API

C# Corner

Learn to add URL-based API versioning to an ASP.NET Core Web API using Asp.Versioning, create v1 and v2 controllers, and preserve compatibility for existing clients.

Topics: ASP.NET Core REST API Web API

10 Tools Every .NET Developer Should Use in 2026

Medium

The developer toolkit looks very different in 2026 than it did just two years ago, or even a year ago.Continue reading on CodeX »

How to Fix Power Automate Flows That Work in DEV but Fail in PROD with 401 Unauthorized

C# Corner - Ketan Sathavara

Building a Production Local RAG Agent in ASP.NET

Medium

A fixed RAG pipeline always retrieves before calling the model. That works for simple Q&A, but it wastes tokens on questions the model…

Topics: ASP.NET Core

Visual Studio September Update - Power Your Workflow with Your Model

Microsoft Dev Blogs - Mark Downie

The best LLM in Visual Studio is the one you choose. This month's update puts that idea front and center: pick the model that fits how you work, then use it everywhere GitHub Copilot already helps you...

Topics: GitHub Copilot Visual Studio

Why I Built a Multi-Paxos Library for .NET

Medium

Inside a Multi-Paxos Library — Part 1: turning agreement, application state, and failure into explicit architectural boundaries.

Topics: C# Design Patterns

Claude Skills for .NET: Teach AI to Build Features Your Way

Medium

Every developer who uses AI has felt this.Continue reading on CodeX »

Memory-efficient JSON in .NET 10 web APIs with PipeReader

elmah.io Blog - .NET Technical tutorials/guides and new features

Deserializing a JSON payload with a million objects strains memory and the garbage collector. .NET 10 adds PipeReader support to System.Text.Json, letting the serializer read straight from a pipeline....

Topics: .NET 10 Performance System.Text.Json

How to Handle Graceful Shutdown in ASP.NET Core Background Services

C# Corner

Learn how to implement graceful shutdown for ASP.NET Core background services using cancellation tokens, safe work handling, dependency injection scopes, and recovery strategies.

Topics: ASP.NET Core

MSSQL Extension for VS Code: New Getting Started Page, Agent skills, SQL Formatter, and more

Microsoft Dev Blogs - Yo-Lei Chen

Get started faster with common SQL workflows and resources in one place. The MSSQL extension for VS Code v1.46 introduces a new Getting Started page experience in Public Preview with quick actions, gu...

Topics: SQL Server Visual Studio Code

Bring Your Own Model to the GitHub Copilot SDK with C#

Microsoft Dev Blogs

Hi, I know, I keep coming back to the same theme on this blog: agent harnesses. In Build Your Own AI Agent Harness in C# we built one from scratch. In

Topics: C# GitHub Copilot

From Throwing Exceptions to the Result Pattern

Medium

Seven attempts at API error handling, and the one that stayed.

Topics: C# Design Patterns