C# features, OpenAPI, and AI building blocks
This issue covers new C# language features, .NET 9 OpenAPI changes, EF Core tracking performance, Copilot-powered Cosmos DB work, and AI basics.
Jasen's top three picks
- 1 Missed these 12 new C# features?
roundthecode.com
A solid catch-up on C# 12 through 14 features, especially for developers who missed the quieter additions beyond the headline changes.
- 2 Why Scalar is Replacing Swagger in .NET 9 and 10
c-sharpcorner.com
This explains why Scalar matters as .NET 9 leans into built-in OpenAPI, which is useful if you ship APIs often.
- 3 Accelerate Your Cosmos DB Infrastructure with GitHub Copilot CLI and Azure Cosmos DB Agent Kit
devblogs.microsoft.com
Copilot CLI plus Cosmos DB Agent Kit is a practical look at agent-assisted infra work, not just AI demos.
Editor's note
I pulled a pretty mixed lineup this time, from language and design basics to API tooling and AI infrastructure. The C# features roundup and the Scalar/OpenAPI piece are especially useful together if you’re tracking where the platform is headed. I also liked the Cosmos DB Copilot article because it shows what agent-driven work looks like in a real Microsoft stack.
Today's articles
Missed these 12 new C# features?
roundthecode.com
Discover 12 C# features from C# 12, 13 and 14 you may have missed, including primary constructors, collection expressions, extension members and more. The page Missed these 12 new C# features? appeare...
Read articleWhy Scalar is Replacing Swagger in .NET 9 and 10
c-sharpcorner.com
Discover why .NET 9 replaces Swagger with native OpenAPI using Microsoft.AspNetCore.OpenApi and modern UIs like Scalar. Streamline API testing with Postman!
Topics: ASP.NET Core .NET 9 REST API
Read articleAccelerate Your Cosmos DB Infrastructure with GitHub Copilot CLI and Azure Cosmos DB Agent Kit
devblogs.microsoft.com
Modern infrastructure work is increasingly agent driven, but only if your AI actually understands the platform you’re deploying. This guide shows how to turn GitHub Copilot CLI into an Azure Cosmos DB...
Topics: Azure Cosmos DB GitHub Copilot
Read articleBuild a Responsive UI through Prompt Driven Development
dev.to
This article is part of the Prompt Driven Development series from the VS Code YouTube channel. It is based on the video Build a Responsive UI through Prompt Driven Development and explains the concept...
Topics: Azure Visual Studio Code
Read articleHands On Comparison: Building a Dynamic Web App in VS Code and Google Antigravity with Prompts Only
visualstudiomagazine.com
A hands-on test compared Visual Studio Code and Google Antigravity on generating and refining a simple dynamic Ticket Desk web application through prompts, revealing that workflow differences became m...
Topics: GitHub Copilot Visual Studio Code Web API
Read articleEngineering healthcare systems in C#/.NET using HL7 & FHIR and why domain knowledge is important
medium.com
Beyond the code: Why domain expertise is the secret weapon for developers, and a deep dive into building healthcare systems with HL7 & FHIR
Read articleAbstract vs Virtual in C#
c-sharpcorner.com
Confused about abstract vs. virtual in C#? This guide clarifies their differences, usage scenarios, and common pitfalls. Learn when to use each for robust code design.
Topics: C# Solid Principles
Read articleWhat is AsNoTracking() in EF Core? Explained in the Easiest Way
medium.com
Improve EF Core performance instantly! Discover how .AsNoTracking() can speed up your queries and reduce memory usage — simply explained
Topics: EF Core Performance
Read article.NET AI Essentials - The Core Building Blocks Explained
devblogs.microsoft.com
Artificial Intelligence (AI) is transforming how we build applications. The .NET team has prioritized keeping pace with the rapid changes in generative AI and continue to provide tools, libraries, and...
Read articleCommon C# Mistakes Even Senior Developers Make
c-sharpcorner.com
Avoid common C# pitfalls! Even experienced developers make mistakes like misusing async/await, ignoring IDisposable, and over-abstracting. Learn to write better C# code.
Topics: C# .NET Core Performance
Read article