Editor's note
I pulled a very mixed lineup again, from beginner mistakes to deep-dive performance and security pieces. EFCore.Visualizer stood out because it brings query-plan insight straight into Visual Studio, and the JWT/security articles are practical for anyone shipping APIs.
ASP.NET Core security, EF Core tuning, and C# async patterns
Jasen Fici
September 01, 2025
Kickstart your week with .NET wisdom that’s slicker than a Monday morning coffee jolt. As sky-high ambition meets the steadfast resolve of a seasoned developer, we’re serving a buffet of insights to feed your professional prowess. This lineup isn’t just code—it's the ultimate roadmap to mastering the harmonious art of .NET development. Prepare your mind for the challenge: the rest of the week will thank you.
Today's Articles
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Jasen's take on today's picks
5 Common .NET Developer Mistakes and How to Avoid Them
A solid starter piece that calls out beginner mistakes before they become habits.
The C# Feature That Saves You Thousands… But No One Talks About
A clever C# angle worth reading if you're looking for a high-impact language feature most devs overlook.
Day 11: Exploring the Depths of IAsyncEnumerable and Asynchronous Streams in .NET
A focused look at async streams that goes beyond async/await and into real iteration patterns.
Performance tips in C# that won’t cost you anything
Practical performance reminders that are easy to apply without changing your architecture.
CommandResponse: Simplifying Success and Error Handling in C#
A response-pattern article that helps keep success and failure handling consistent across codebases.
Enhancing UI Code Quality with C# 12 (.NET 10)
C# 12 UI cleanup ideas that are especially relevant as .NET 10 work starts to land.
The Most Expensive Line of Code I Ever Wrote in C#
A cautionary story about one small line of code with an outsized production cost.
.NET AI Community Standup: AI Tools Every .NET Dev Needs 📎
The AI community standup is a useful checkpoint for .NET developers tracking Microsoft’s Copilot and agent tooling.
EFCore.Visualizer - View Entity Framework Core query plan inside Visual Studio
EFCore.Visualizer is the kind of tool that saves time by exposing query plans directly in Visual Studio.
Async vs Parallel in .NET Explained: Stop Mixing Them Up
A clear comparison of async and parallel execution that should prevent common scalability mistakes.
Credential Security in ASP.NET Core Web API: Best Practices and Implementation
Security guidance for ASP.NET Core Web APIs, with secret management and Azure Key Vault in the mix.
The EF Core Tuning Guide Microsoft Forgot to Write
A tuning-focused EF Core guide for teams trying to squeeze more out of data access.
Data Security in ASP.NET Core MVC Applications
MVC security basics still matter, and this one covers the essentials without overcomplicating them.
Entity Framework Unveiled: A Comprehensive Guide to .NET’s Premier ORM
A broad EF overview, useful if someone on the team needs the ORM story from the ground up.
Serilog Tips and Tricks: Structured Console Logging with Formatting
Serilog tips that improve console output and make logs easier to scan in real time.
Stop Allocating So Much: .NET 9 Cache and Memory Hacks That Actually Work
Memory and cache advice for .NET 9 that should help teams reduce hidden allocation pressure.
Best Free Alternatives to AutoMapper in .NET — Why We Moved to Mapperly
A practical AutoMapper alternative write-up for teams reconsidering mapping dependencies.
ASP.NET Core in .NET 9 Middleware Order: The Setup That Actually Works
Middleware order can make or break ASP.NET Core behavior, so this is worth a careful read.
The Little .NET Fixes That Make a Big Difference
Small fixes often add up, and this .NET 9 cookbook entry leans into that mindset.
️ Installing .NET on macOS with dotnet-install.sh (and a Few Lessons Learned)
A hands-on macOS install guide with lessons learned for anyone setting up .NET on a Mac.
Securing ASP.NET Core Web APIs with JWT Authentication
JWT authentication plus authorization basics make this a practical API security companion piece.
Microsoft Announces the Awesome Copilot MCP Server
The new Copilot MCP Server announcement is notable for developers customizing AI workflows.
Invisible .NET Performance Killers: Framework Features That Fail at Scale
A scale-focused performance warning that connects common framework choices to hidden overhead.