C# 14, Agent Framework, ASP.NET Core Testing
Coverage spans C# 14 and union types, Playwright and health checks, Agent Framework telemetry, EF Core pitfalls, and API security with Entra ID.
Jasen's top three picks
- 1 C# 14 New Features Explained with Practical Examples
c-sharpcorner.com
A solid tour of upcoming language features, especially helpful if you want examples instead of release-note prose.
- 2 Playwright Testing for ASP.NET Core Applications: A Practical Guide
c-sharpcorner.com
Good practical testing piece; Playwright keeps earning its place for end-to-end coverage in ASP.NET Core apps.
- 3 Middleware in Microsoft Agent Framework
jesseliberty.com
Token-aware middleware is exactly the kind of cross-cutting concern agent apps need early, not after costs spike.
Editor's note
I kept this one nicely mixed on purpose. The C# 14 feature walkthrough is useful because it stays practical, while the Agent Framework telemetry and memory posts show where the .NET AI stack is getting more operationally serious. I also liked seeing EF Core’s N+1 problem and ASP.NET Core health checks in the same issue—both are the sort of fundamentals that save pain later.
Today's articles
C# 14 New Features Explained with Practical Examples
c-sharpcorner.com
Explore C# 14's new features: Extension Members, Collection Expressions, Pattern Matching, Primary Constructors, Null Safety, and .NET integration.
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Playwright Testing for ASP.NET Core Applications: A Practical Guide
c-sharpcorner.com
Master Playwright for ASP.NET Core E2E testing. Learn setup, writing tests, best practices, and CI/CD integration for reliable web app validation.
Topics: ASP.NET Core Unit Testing
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Middleware in Microsoft Agent Framework
jesseliberty.com
A critical need, when creating multi-agent applications is to manage token usage in API calls. This is where middleware plays a crucial role. In this post, we will explore what middleware is within th...
Topics: .NET Core OpenTelemetry
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C# Union Types Explained: What's New in .NET 11 and When to Use Them
c-sharpcorner.com
Explore C# Union Types in .NET 11! Learn how they simplify handling multiple outcomes, improve type safety, and lead to cleaner, more maintainable code.
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How I Use dotnet-claude-kit: Making Claude Code Write Senior-Level .NET
codewithmukesh.com
Install and use dotnet-claude-kit: 47 skills, 10 agents, 16 commands, and 20 Roslyn MCP tools that make Claude Code write production-ready .NET 10 code.
Topics: .NET 10 GitHub Copilot Roslyn
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Logging & OpenTelemetry in MAF
jesseliberty.com
In the rapidly evolving landscape of software development, particularly in the realm of artificial intelligence and automation, the importance of robust logging mechanisms cannot be overstated. This i...
Topics: .NET Core OpenTelemetry
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OpenTelemetry Observability in ASP.NET Core: End-to-End Guide
c-sharpcorner.com
Master OpenTelemetry in ASP.NET Core for robust observability. Learn to integrate logs, metrics, and distributed traces for better performance and troubleshooting.
Topics: ASP.NET Core OpenTelemetry Performance
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Blazor Web Apps in .NET 11: What's New for Full-Stack Development
c-sharpcorner.com
Explore Blazor Web Apps in .NET 11: new features for faster performance, enhanced developer productivity, and seamless full-stack C# development.
Read articleBuilding AI Features with the OpenAI Responses API in ASP.NET Core
c-sharpcorner.com
Integrate OpenAI's unified Responses API into ASP.NET Core for AI features like chatbots, content generation, and summarization. Simplify AI development.
Topics: ASP.NET Core OpenAI Web API
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Native Agent Memory for Microsoft Agent Framework, Powered by Azure Cosmos DB
devblogs.microsoft.com
Recently we introduced the Agent Memory Toolkit
Topics: Azure Cosmos DB .NET Core
Read articleTop 30 .NET Interview Questions for 2+ Years Experience (With Simple Answers & Examples) — Part 1…
medium.com
Preparing for a .NET interview can be overwhelming, especially when there are hundreds of concepts to learn.
Read articleSilverlight Died in 2021. I Just Rebuilt It — For Free.
medium.com
Silverlight officially reached end-of-life years ago.
Topics: .NET Framework
Read articleSecuring ASP.NET Core APIs with Microsoft Entra ID Authentication
c-sharpcorner.com
Secure ASP.NET Core APIs with Microsoft Entra ID. Learn authentication, configuration, and best practices for robust API security.
Topics: ASP.NET Core Authentication Security
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The Microsoft Agent Framework Harness is now released
devblogs.microsoft.com
Your agents can now be built on a stable, batteries-included harness - the loop, planning, memory, context management, approvals, and telemetry that turn a model into an agent that actually does thing...
Topics: .NET Core OpenTelemetry
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GitHub Copilot Agent for .NET Projects
c-sharpcorner.com
Unlock .NET development with GitHub Copilot Agent! Automate tasks, accelerate features, and improve code quality. Your AI coding assistant.
Topics: .NET Core GitHub Copilot
Read articleASP.NET Core Health Checks Tutorial
c-sharpcorner.com
Master ASP.NET Core Health Checks! Learn to monitor app health, dependencies, and ensure production readiness for reliable applications.
Topics: ASP.NET Core Performance
Read articleBuild AI Agents with .NET 10 and Semantic Kernel
c-sharpcorner.com
Build AI agents with .NET 10 and Semantic Kernel. Learn production practices for reliable, scalable AI applications.
Topics: .NET 10 OpenAI Semantic Kernel
Read articleThe N+1 Query Problem in EF Core (And How to Spot It Before Production Does)
medium.com
A page that felt fine in testing is slow in production. Same code, same query, but now it crawls. You open the SQL log and there it is —…
Topics: EF Core Performance Profiling
Read articleYou Probably Don’t Need MediatR
medium.com
MediatR shows up in a lot of .NET codebases by default now. Someone starts a project, adds it in the first week, and every request goes…
Topics: Design Patterns MediatR
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Building RAG Applications in C# with Semantic Kernel and Azure AI Search
c-sharpcorner.com
Build C# RAG apps with Semantic Kernel & Azure AI Search. Ground LLMs in your data for accurate, context-aware responses.
Topics: Azure OpenAI Semantic Kernel
Read articleHow to Build Clean Telegram Bots in .NET 8+ Using the Mediator Pattern and FSM
medium.com
Say goodbye to massive switch-case statements and nested if-conditions in your Telegram.Bot update handler.
Topics: Design Patterns .NET 8 MediatR
Read articleReal-World MediatR Patterns and Common Mistakes in ASP.NET Core
c-sharpcorner.com
Master MediatR in ASP.NET Core! Learn patterns, avoid common mistakes, and build maintainable, decoupled applications.
Topics: ASP.NET Core Design Patterns MediatR
Read articleASP.NET Core Request Pipeline Explained with Real Examples
c-sharpcorner.com
Master the ASP.NET Core request pipeline! Learn about middleware, order, and real-world examples for efficient, secure web apps.
Topics: ASP.NET Core .NET Core
Read articleGitHub Copilot Enterprise Best Practices for .NET Teams
c-sharpcorner.com
Unlock GitHub Copilot Enterprise for .NET teams! Master best practices for AI-assisted coding, ensuring quality, security, and maintainability.
Topics: .NET Core GitHub Copilot Security
Read articleFeature Flags in .NET: Ship Dark, Release on Your Terms with Microsoft.FeatureManagement
medium.com
Every senior engineer eventually hits the same wall: a feature is code-complete, but the business isn’t ready to expose it, or wants it…
Topics: Design Patterns .NET Core
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