Topics: ASP.NET Core C# Dapper Design Patterns .NET Core EF Core Minimal APIs Performance PostgreSQL Redis

Editor's note

I pulled together a very mixed lineup this time, from low-level performance work to practical architecture and beginner-friendly C# articles. The Span/memory piece and the caching write-up stood out because they’re the kind of posts that can immediately change how you think about hot-path code. I also like the Dapper + EF Core article for showing a pragmatic data-access blend instead of forcing one tool everywhere.

Span, caching, and microservices in .NET

Jasen Fici
October 15, 2025

Welcome to this week's midweek .NET wisdom, where code meets quirkiness, and Wednesday becomes your favorite coding companion. Today, we unravel .NET mysteries with the precision of a Swiss watch and the charm of a classic '80s mixtape. Ready to flex those seasoned programming skills and maybe even chuckle? Scroll on, fellow code conqueror; your tech-savvy adventure awaits!

Today's Articles

⚡ Understanding Span and Memory in C#: The Hidden Power Behind Modern High-Performance .NET

https://mohit8830.medium.com/understanding-span-and-memory-in-c-the-hidden-power-behind-modern-high-performance-net-4c3e8d972e4f

List<T> = Flexible but slow (heap-based, many allocations) Span<T> = Ultra-fast, stack-based, local memory access Memory<T> = Async-safe…

Implement UPSERT – Insert and Update using Fabric Data Pipeline

https://www.c-sharpcorner.com/article/implement-upsert-insert-and-update-using-fabric-data-pipeline/

Discover how to efficiently implement UPSERT (Update or Insert) operations within Fabric Data Pipelines. This guide provides a practical approach to seamlessly manage data updates and insertions, ensu...

How to Create a Custom .NET Package and Import It Locally

https://medium.com/@aamritbistaa/how-to-create-a-custom-net-package-and-import-it-locally-feb6b846e935

Creating a custom package is a great way to reuse common code across multiple projects.

Unsafe Code in C#: When and Why It’s Worth It

https://medium.com/@kittikawin_ball/unsafe-code-in-c-when-and-why-its-worth-it-79b90a4c49c5?source=rss------dotnet-5

Discover how unsafe code in .NET lets you trade safety for speed, master pointers, and optimize performance-critical applications.

Understanding API in .NET Core — A Beginner-Friendly Guide with Real-Life Example

https://www.c-sharpcorner.com/article/understanding-api-in-net-core-a-beginner-friendly-guide-with-real-life-exampl/

Unlock the power of APIs in .NET Core with this beginner-friendly guide! Learn to build a simple web API, understand endpoints, and connect frontends to backends using real-world examples like job por...

20 Killer C# One-Liners

https://medium.com/programming-letters/20-killer-c-one-liners-6e3845fa2036

A senior-dev grab bag of 20 practical C# one-liners — guards, LINQ, JSON, async timeouts — each with when to use and pitfalls. Copy, paste… Continue reading on Programming Letters »

Extension Methods in C#: Write Cleaner, Smarter, and More Reusable Code

https://rahulyadav9053.medium.com/extension-methods-in-c-write-cleaner-smarter-and-more-reusable-code-c01e5b5dc3d5

Make your C# code more expressive and readable by using extension methods — the hidden gem behind LINQ and fluent APIs. Learn how to use…

How .NET Code Works Behind the Scenes: Explained for Beginners

https://medium.com/@sweetondonie/how-net-code-works-behind-the-scenes-explained-for-beginners-16cc8b9cd3d9

Ever wondered what really happens when you hit “Run” in a .NET app?

.Net Yarp ile API Gateway Entegrasyonu

https://medium.com/@fatihmandiralii/net-yarp-ile-api-gateway-entegrasyonu-8b04ff608fcf

Merhabalar, Bu yazımda .Net Yarp ile API Gateway entegrasyonu gerçekleştireceğiz. İlk olarak API Gateway ve Yarp(Yet Another Reverse…

Microservices in .NET Core: A Beginner-Friendly Guide

https://www.c-sharpcorner.com/article/microservices-in-net-co-a-beginner-friendly-guide/

Unlock the power of microservices in .NET Core with this beginner-friendly guide! Learn how to build scalable, maintainable, and resilient applications by breaking them down into independent services....

https://medium.com/@supraja.tangella/-90813610dd60

Your .NET app’s biggest performance issue isn’t CPU — it’s memory misuse.

Advanced OOP Features in C#: Beyond the Four Pillars

https://medium.com/@sweetondonie/advanced-oop-features-in-c-beyond-the-four-pillars-caabae0122f8

When I first learned the four OOP pillars — encapsulation, inheritance, polymorphism, and abstraction — I thought I had unlocked the…

How the lock Keyword Works in C#: Thread Safety Demystified

https://medium.com/@kittikawin_ball/how-the-lock-keyword-works-in-c-thread-safety-demystified-15f434debd05

Understand how the C# lock keyword prevents race conditions, how it works internally, and when to use advanced synchronization methods.

.NET AI Community Standup - Getting Started with the Microsoft Agent Framework

https://www.youtube.com/watch?v=KDxi3NG3nfU

Thread Safety in .NET: Avoiding Race Conditions and Deadlocks

https://medium.com/@karthikns999/thread-safety-in-net-avoiding-race-conditions-and-deadlocks-81014ce4758a

Write once, run safely everywhere

Your .NET App Doesn’t Need a Database on the Hot Path — Meet the Local Caching Revolution

https://medium.com/illuminations-mirror/your-net-app-doesnt-need-a-database-on-the-hot-path-meet-the-local-caching-revolution-ed451e313951

How hybrid in-memory + distributed caching patterns are quietly replacing database round-trips in real-world .NET systems. Continue reading on ILLUMINATION’S MIRROR »

.NET Debug vs Release Mode: The Complete Developer’s Guide

https://medium.com/@hpultimatemedia/net-debug-vs-release-mode-the-complete-developers-guide-6fa8ccfee6ff

Unlock the secrets of .NET compilation modes and supercharge your development workflow

Master Static, Sealed, and Constructors in C# — Learn with a Real Bank Story

https://medium.com/@solanki.jignesh.r/master-static-sealed-and-constructors-in-c-learn-with-a-real-bank-story-0944e5a6c72d

A beginner-friendly guide to understanding the most confusing C# keywords through a fun and realistic Bank example.

C# Channel Mastery: Advanced Patterns for Async Pros

https://blog.stackademic.com/c-channel-mastery-advanced-patterns-for-async-pros-5297b3ae0446

Part 5 in a beginner-friendly guide to thread-safe async messaging in .NET Continue reading on Stackademic »

Dapper + Entity Framework Core (EF Core) together against PostgreSQL in .NET 8

https://www.c-sharpcorner.com/article/dapper-entity-framework-core-ef-core-together-against-postgresql-in-net-8/

Combine the power of Entity Framework Core (EF Core) for schema management and Dapper for raw SQL performance in .NET 8 with PostgreSQL. This guide explores two approaches: using EF Core for CRUD and ...