Topics: ASP.NET Core Azure Blazor C# .NET 10 .NET Core .NET Framework EF Core FluentValidation GitHub GitHub Copilot Native AOT OpenAI Performance REST API Security

Editor's note

I curated a pretty classic mixed bag today: performance, architecture, validation, and a bit of platform news. The ASP.NET Core latency piece and the EF Core ToArrayAsync vs ToListAsync note are both practical reads if you care about where time really goes. I also liked the AWS Transform Web Forms to Blazor item and the Advanced Security work-item linking update for teams juggling modernization and fixes.

Latency, validation, and agent tooling

Jasen Fici
December 22, 2025

Hey crew — I spent a lot if time tuning our newsletter to filter out the paywalled articles. There are still a few here and there but for the most part, all the articles should be accessible.

Enjoying the newsletter? Your feedback helps us grow and reach more developers.

Share your testimonial →

Today's Articles

Latency Is a Feature, Not a Bug

https://medium.com/@vahidbakhtiaryinfo/latency-is-a-feature-not-a-bug-8c91aa769b6b?source=rss------dotnet-5

Designing APIs for Perceived Performance in ASP.NET Core

Modernize ASP.NET Web Forms UI to Blazor with AWS Transform

https://news.google.com/rss/articles/CBMinAFBVV95cUxNb29Xcm9FX2dxbDNyMjlUb3R4dHBJVm84UlJ1bG9IeGxLQWY5ZjEzR0h3WVU0Y0YzV2ZVUnpSZy0wQTZPRDc1UXZ0aU8xRjJ5Y0QwS01wVmcwUlNjdU5COUhtTjFiOHUtU3hiVURUYXlvZm5iMjFFZXFzZURfc05udjBlZnNpaElfcU5tdHFMVEdJYm94Y01KaXM0TF8?oc=5

Modernize ASP.NET Web Forms UI to Blazor with AWS Transform

Stop writing all validation logic inside your .NET Controllers

https://medium.com/readers-club/stop-writing-all-validation-logic-inside-your-net-controllers-9751d679aaf4?source=rss------dotnet-5

Your controller should be a traffic cop not a security guard. Continue reading on Readers Club »

Work item linking for Advanced Security alerts now available

https://devblogs.microsoft.com/devops/work-item-linking-for-advanced-security-alerts-now-available/

Security vulnerabilities don't fix themselves. Someone needs to track them, prioritize them, and actually ship the fix. If you've ever tried to manage security alerts alongside your regular sprint wor...

Armchair Architects: Best Practices For Architecting AI Agents

https://www.youtube.com/watch?v=pwtY8O_YvSI

- Build Agents using Model Context Protocol on Azure https://learn.microsoft.com/azure/developer/ai/intro-agents-mcp - Protocols for Integration: The role of Model Context Protocol (MCP) and Agent-to...

The Full Stack Developer is a Myth (And It’s Ruining Your Career)

https://medium.com/@riturajpokhriyal/the-full-stack-developer-is-a-myth-and-its-ruining-your-career-c9e1ca9c3851?source=rss------dotnet-5

Why trying to be a “Senior” in both .NET and React is making you mediocre at both.

Dependency Injection (DI) in ASP.NET Core (without magic)

https://medium.com/@ruirodrigues04/dependency-injection-di-in-asp-net-core-without-magic-385e9b8e9f99?source=rss------dotnet-5

When I first started with ASP.NET Core, Dependency Injection sounded scary. People talked about “IoC containers”, “lifetimes”, and other…

One Minute Knowledge: Is ToArrayAsync or ToListAsync faster for Entity Framework?

https://steven-giesel.com/blogPost/55dbb67c-cd14-444f-81e8-dec9f5ce1448

Short question, and a short answer: ToListAsync - but why?

A Comprehensive Guide for FluentValidation in .NET

https://medium.com/@mhmdelbaz57/a-comprehensive-guide-for-fluentvalidation-in-net-dfee2d3eb23f?source=rss------dotnet-5

Master object validation in .NET with clean, maintainable, and flexible validation rules

Build a Social Media Commander app with Agent Instructions using GitHub Copilot | MVP Unplugged

https://www.youtube.com/watch?v=2EJR1xhTtBs

Host Justin Garrett, Microsoft Principal Customer Experience Program Manager, connects with Microsoft MVP Jeremy Sinclair to dive into Jeremy’s passion project: Social Media Commander—a cross-platform...

Best Practices For Building REST APIs

https://antondevtips.com/blog/best-practices-for-building-rest-apis

Learn the best practices for building secure, scalable, and maintainable REST APIs in .NET. Learn about REST Maturity levels, resource naming, HTTP methods and status codes, API versioning, request/re

Server-Sent Events in ASP.NET Core and .NET 10

https://www.milanjovanovic.tech/blog/server-sent-events-in-aspnetcore-and-dotnet-10

ASP.NET Core 10 introduces native Server-Sent Events as a lightweight, HTTP-native alternative to SignalR for simple one-way real-time updates like dashboards and notifications.

Dot NET: From Framework to Core and Beyond

https://medium.com/@sidatmsm/dot-net-from-framework-to-core-and-beyond-b8935cd2a057?source=rss------dotnet-5

The .NET architecture has significantly transformed after its introduction by Microsoft in the early 2000s. Moreover, the platform has…

LINQ in Real Projects: 7 Patterns Every C# Developer Should Know

https://towardsdev.com/linq-in-real-projects-7-patterns-every-c-developer-should-know-da165e3cec39?source=rss------dotnet-5

Most developers only use LINQ for .Where() and .Select(). Continue reading on Towards Dev »

Creating a .NET CLR profiler using C# and NativeAOT with Silhouette

https://andrewlock.net/creating-a-dotnet-profiler-using-csharp-with-silhouette/

In this post I look at how to create a simple .NET profiler. But instead of using C++, the profiler uses C# and NativeAOT with the Silhouette library

Why “Microservices” Debates Miss the Point

https://codeopinion.com/why-microservices-debates-miss-the-point/

DHH had a take on microservices in small teams that is getting a lot of attention. And while I agree with what he’s pointing out, all of these types of conversations miss what actually matters. This i...