Editor's note
I kept this issue intentionally mixed, from AI and API design to performance, security, and language features. The GPT-4.1 API piece and Andrew Lock’s AI-template chatbot post stand out for practical adoption, while the EF Core and CORS articles are the kind of reminders that save teams pain later.
GPT-4.1, EF Core, and API guardrails
Jasen Fici
May 23, 2025
As we park ourselves in the fast lane of Friday, let's gear up for a reflective ride with our trusty .NET toolkit. This week's groove feels like a classic mixtape of vintage coding wisdom and the latest in tech hit singles. Whether you're planning a weekend debugging spree or some well-earned down time, this newsletter's insights are sure to keep your developer's engine purring smoothly. Buckle up and enjoy the cruise through the codeverse.
Today's Articles
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Jasen's take on today's picks
Introducing GPT-4.1 in the API: Faster, Smarter, and More Powerful
OpenAI’s GPT-4.1 API write-up is the sort of release note you actually want to read if you’re planning real app integration.
Want to Be a Top .NET Developer? Follow These 20 Coding Rules Every
The coding-rules piece leans classic, but it’s useful as a reminder that consistency still beats heroics in everyday .NET work.
The Risks of Misconfigured CORS in Web Development
Misconfigured CORS remains an easy way to create security bugs, so this is a timely refresher for anyone shipping APIs.
dotNetDave Says… Avoid Going Across the Wire Until Necessary!
DotNetDave’s advice about delaying wire calls is solid performance hygiene; unnecessary round-trips add up fast.
Understanding the Difference Between .NET and C#
The .NET-versus-C# explainer is beginner-friendly, but it can also help teams reset terminology when discussions get sloppy.
Your Entity Framework Code is Too Slow — Here’s Why
If your EF Core code feels sluggish, this article should help you inspect query shape, tracking, and other common bottlenecks.
🔴 VS Code Live - Security Guardrails for VS Code Agent Mode
The VS Code agent-mode security guardrails session is worth watching if you’re experimenting with AI-assisted coding tools.
Using the new AI template to create a chatbot about a website
Andrew Lock’s chatbot demo is a practical example of turning the new AI template into something specific and useful.
Stop Using IResult — Your API Deserves the Truth
The IResult critique pushes API authors toward clearer contracts, which usually makes consumers and tests happier.
3 Architecture Patterns Every .NET Developer Must Know
The architecture-patterns roundup is a broad refresher for developers who want structure without overcomplicating the design.
The Value of Vibe Coding and Vibe Tools in Creating High-Impact Proof of Concepts
“Vibe coding” can be messy, but for proof-of-concepts the article makes a reasonable case for speed with intent.
The Stunning Impact of C#’s New Primary Constructors
Primary constructors continue to make C# more concise; this post highlights where the feature changes day-to-day class design.
C# Record Type Overview as Diagram
The record-type diagram is a nice visual aid for anyone teaching or learning modern C# data modeling.
From performance gains to scalability hacks: A Practical Guide for .NET Developers
The performance-and-scalability guide is a good grab bag of practical habits rather than abstract advice.
Say Goodbye to AutoMapper: Why .NET Devs Are Switching to Mapperly
Mapperly over AutoMapper is an increasingly common tradeoff: more compile-time safety, less magic, and often better performance.