GPT-4.1, EF Core, and API guardrails
A varied .NET roundup with OpenAI’s GPT-4.1 API, EF Core slowdown advice, CORS security pitfalls, Mapperly, and C# language updates.
Jasen's top three picks
- 1 Introducing GPT-4.1 in the API: Faster, Smarter, and More Powerful
c-sharpcorner.com
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.
- 2 Want to Be a Top .NET Developer? Follow These 20 Coding Rules Every
medium.com
The coding-rules piece leans classic, but it’s useful as a reminder that consistency still beats heroics in everyday .NET work.
- 3 The Risks of Misconfigured CORS in Web Development
c-sharpcorner.com
Misconfigured CORS remains an easy way to create security bugs, so this is a timely refresher for anyone shipping APIs.
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.
Today's articles
Introducing GPT-4.1 in the API: Faster, Smarter, and More Powerful
c-sharpcorner.com
https://www.c-sharpcorner.com/news/introducing-gpt41-in-the-api-faster-smarter-and-more-powerful
Topics: OpenAI
Read articleWant to Be a Top .NET Developer? Follow These 20 Coding Rules Every
medium.com
https://medium.com/@hasanmcse/want-to-be-a-top-net-developer-follow-these-20-coding-rules-every-06e1f94a8cdc
Topics: C#
Read articleThe Risks of Misconfigured CORS in Web Development
c-sharpcorner.com
https://www.c-sharpcorner.com/blogs/the-risks-of-misconfigured-cors-in-web-development
Topics: ASP.NET Core Security
Read articledotNetDave Says… Avoid Going Across the Wire Until Necessary!
dotnettips.wordpress.com
https://dotnettips.wordpress.com/2025/05/12/dotnetdave-says-avoid-going-across-the-wire-until-necessary/
Topics: .NET Core Performance
Read articleUnderstanding the Difference Between .NET and C#
lock29down.medium.com
https://lock29down.medium.com/understanding-the-difference-between-net-and-c-14fb9f8c24b2
Read articleYour Entity Framework Code is Too Slow — Here’s Why
medium.com
https://medium.com/dot-net-sql-learning/your-entity-framework-code-is-too-slow-heres-why-a4951bdd8300
Topics: EF Core Performance
Read article🔴 VS Code Live - Security Guardrails for VS Code Agent Mode
youtube.com
https://www.youtube.com/watch?v=Uolr0QdQeYA
Topics: GitHub Copilot Security Visual Studio Code
Read articleUsing the new AI template to create a chatbot about a website
andrewlock.net
https://andrewlock.net/using-the-new-ai-template-to-create-a-chatbot-about-a-website/
Topics: ASP.NET Core OpenAI
Read articleStop Using IResult — Your API Deserves the Truth
medium.com
https://medium.com/@metoz.florian/stop-using-iresult-your-api-deserves-the-truth-7eca0cacdfed
Topics: ASP.NET Core REST API
Read article3 Architecture Patterns Every .NET Developer Must Know
medium.com
https://medium.com/dot-net-sql-learning/3-architecture-patterns-every-net-developer-must-know-33b556c052e4
Topics: Clean Architecture Design Patterns
Read articleThe Value of Vibe Coding and Vibe Tools in Creating High-Impact Proof of Concepts
c-sharpcorner.com
https://www.c-sharpcorner.com/article/the-value-of-vibe-coding-and-vibe-tools-in-creating-high-impact-proof-of-concept/
Topics: C# Design Patterns
Read articleThe Stunning Impact of C#’s New Primary Constructors
medium.com
https://medium.com/@nagarajvela/the-stunning-impact-of-c-s-new-primary-constructors-c7e330b3cfab
Topics: C#
Read articleC# Record Type Overview as Diagram
medium.com
https://medium.com/@mmmsonu/c-record-type-overview-as-diagram-696974561765
Topics: C#
Read articleFrom performance gains to scalability hacks: A Practical Guide for .NET Developers
medium.com
https://medium.com/@mikhail.petrusheuski/from-performance-gains-to-scalability-hacks-a-practical-guide-for-net-developers-b02a1b29a98d
Topics: .NET Core Performance
Read articleSay Goodbye to AutoMapper: Why .NET Devs Are Switching to Mapperly
itnext.io
https://itnext.io/say-goodbye-to-automapper-why-net-devs-are-switching-to-mapperly-1730ce4a654f
Topics: AutoMapper Performance Source Generators
Read article