Home Archive LINQ, APIs, and observability in .NET – .NET News Daily Issue #398 (Feb 24, 2026)

Editor's note

I curated a very mixed issue this time: from LINQ laziness and middleware internals to API design, observability, and AI tooling. The OpenTelemetry piece and the Visual Studio 2026 release stood out because they affect daily development work right away.

LINQ, APIs, and observability in .NET

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Today's Articles

How LINQ Execution Actually Works: Power of Being Lazy

https://medium.com/@sketch.paintings/how-linq-execution-actually-works-power-of-being-lazy-76e98578642c?source=rss------dotnet-5

Have you ever written a beautifully complex LINQ query, stepped through it with your debugger, and noticed that your app didn’t actually…

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Stop Cascading Failures: A Practical Guide to the Circuit Breaker Pattern in .NET

https://medium.com/@shivanshgaur28/stop-cascading-failures-a-practical-guide-to-the-circuit-breaker-pattern-in-net-d2a2e7bf7c84?source=rss------csharp-5

How to prevent cascading failures in distributed systems using Polly.

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What Are the New Features in C# 13?

https://www.c-sharpcorner.com/article/what-are-the-new-features-in-c-sharp-13/

Explore C# 13's new features: enhanced params, ref structs, partial properties, compiler optimizations & .NET 9 interoperability for cleaner, faster code!

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Solving SOLID Problems with Design Patterns in .NET

https://medium.com/@aselakotagama/solving-solid-problems-with-design-patterns-in-net-a1e7514597bc?source=rss------dotnet-5

Introduction

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A smarter way to learn .NET without reading the docs

https://www.roundthecode.com/dotnet-blog/smarter-way-learn-dotnet-without-reading-docs

Discover how .NET concepts can be learned without reading documentation, using AI tools to turn docs and videos into podcasts, summaries and mind maps. The page A smarter way to learn .NET without rea...

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Step-by-step guide to create an ASP.NET Core project through Visual Studio

https://medium.com/@shamilasiva03/step-by-step-guide-to-create-an-asp-net-core-project-through-visual-studio-4e9df877b1a9?source=rss------dotnet-5

1.Install Visual Studio

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Pagination, Sorting & Searching in ASP.NET Core Web API

https://codewithmukesh.com/blog/pagination-sorting-searching-aspnet-core-webapi/

Implement pagination, sorting, and searching in ASP.NET Core Web API with EF Core 10. Offset & keyset pagination, dynamic sorting, and performance tips.

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Building CRUD API with Dapper and Dapper Plus in ASP.NET Core

https://codingsonata.medium.com/building-crud-api-with-dapper-and-dapper-plus-in-asp-net-core-474ebb80d277?source=rss------dotnet-5

When it comes to building CRUD API, you do not have to choose between control and productivity.

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Middleware Deep Drive in .NET

https://medium.com/@shreyans_padmani/middleware-deep-drive-in-net-44b7be84d4be?source=rss------dotnet-5

Middleware in .NET acts as a request pipeline component that handles logging, authentication, routing, and error handling. Each middleware…

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Microsoft.Extensions.AI: The .NET Feature That’s Quietly Killing Boilerplate

https://medium.com/@krativarshney7/microsoft-extensions-ai-the-net-feature-thats-quietly-killing-boilerplate-52df3d976c8d?source=rss------csharp-5

.NET 9 added AI abstractions that make integrating LLMs stupidly simple. Here’s why nobody’s talking about it. Continue reading on JavaScript in Plain English »

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Smart AI Customer Support Chatbot with Angular + ASP.NET Core + Python (ML/NLP)

https://medium.com/@bisheshdhiman5514/smart-ai-customer-support-chatbot-4c5e795ae312?source=rss------dotnet-5

Transforming Customer Support with AI & Full-Stack Engineering

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Visual Studio 2026 18.3 Released

https://news.google.com/rss/articles/CBMijwFBVV95cUxOS1dFR01SUldDZTZKRXBhY3FVYzJoS1RmX3lWLWI1cFBKNUZmc3NuUmRpS1AtNXZWZE9nQTlpSy04VWZ3dGRkdXVVbkk4TE9zZXVvOHVuZmhja3ZocTVOUFRSVVA3OExhaUxKekE1ckFFSEhvZklzTGVDR051b3pIbWxDUXNINk92RnZ5c2ZHTQ?oc=5

Visual Studio 2026 18.3 Released

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Swagger UI: Architecture, Configuration, and Enterprise Implementation Guide

https://www.c-sharpcorner.com/article/swagger-ui-architecture-configuration-and-enterprise-implementation-guide/

Explore Swagger UI: architecture, configuration, and implementation for interactive API documentation. Enhance development and collaboration in modern systems.

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Observability in .NET with OpenTelemetry

https://www.c-sharpcorner.com/article/observability-in-net-with-opentelemetry/

Explore .NET observability with OpenTelemetry! Learn how to monitor distributed applications using logs, metrics, and traces. Plus, a basic setup example included!

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Beyond HTTP: Timer, Queue, and Blob Triggers

https://medium.com/@martinoehlert/beyond-http-timer-queue-and-blob-triggers-80f8ebf0a775?source=rss------dotnet-5

Azure Functions for .NET Developers: Series

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Light up Multiple Databases with a Single API with Data API builder's multi-source configuration

https://devblogs.microsoft.com/azure-sql/multi-source-data-api-builder/

Data API builder (DAB) supports multi-source configurations Data API builder (DAB) connects to your database with a safe REST or GraphQL endpoint. But DAB is not limited to just one database. Using a ...

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LINQ in C#: Understanding the Select() Operator

https://medium.com/@nikolaajdukovic/linq-in-c-understanding-the-select-operator-70c23da1bbc1?source=rss------dotnet-5

When developers first encounter LINQ, they often see Select() as “just a projection method.” But in real systems, Select() is the operator…

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Creating standard and "observable" instruments: System.Diagnostics.Metrics APIs - Part 3

https://andrewlock.net/creating-standard-and-observable-instruments/

In this post I discuss the various Instrument

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Claude Sonnet 4.6 in Microsoft Foundry-Frontier Performance for Scale

https://techcommunity.microsoft.com/blog/azure-ai-foundry-blog/claude-sonnet-4-6-in-microsoft-foundry-frontier-performance-for-scale/4494873

Claude Sonnet 4.6 is available today in Microsoft Foundry, and it is designed for teams who want frontier performance across coding, agents, and professional work at scale. The post Claude Sonnet 4.6...

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Jasen's take on today's picks

How LINQ Execution Actually Works: Power of Being Lazy

A clear look at why LINQ stays lazy until enumeration, which is still a common source of surprises in real apps.

Stop Cascading Failures: A Practical Guide to the Circuit Breaker Pattern in .NET

A practical circuit breaker walkthrough with Polly that helps you stop one failing dependency from taking everything down.

What Are the New Features in C# 13?

A solid refresher on C# 13 changes, especially useful if you’re tracking what lands with .NET 9 and compiler updates.

Solving SOLID Problems with Design Patterns in .NET

Design patterns applied to SOLID problems can be useful when the abstractions are getting messy, not just in theory.

A smarter way to learn .NET without reading the docs

Interesting angle here: using AI to learn .NET from docs and videos without grinding through every page manually.

Step-by-step guide to create an ASP.NET Core project through Visual Studio

This is a straightforward Visual Studio starter guide, handy for absolute beginners but not likely to challenge experienced devs.

Pagination, Sorting & Searching in ASP.NET Core Web API

Good coverage of pagination and searching in ASP.NET Core Web API, with offset versus keyset tradeoffs called out.

Building CRUD API with Dapper and Dapper Plus in ASP.NET Core

Dapper Plus adds speed and convenience to CRUD work, and the article focuses on that control-versus-productivity balance.

Middleware Deep Drive in .NET

Middleware remains one of the most important parts of the ASP.NET Core pipeline, so a deep dive is always worth a read.

Microsoft.Extensions.AI: The .NET Feature That’s Quietly Killing Boilerplate

Microsoft.Extensions.AI is the quiet productivity win here: less glue code when adding LLM features to .NET 9 apps.

Smart AI Customer Support Chatbot with Angular + ASP.NET Core + Python (ML/NLP)

A full-stack chatbot example that blends Angular, ASP.NET Core, and Python is ambitious, though more demo than blueprint.

Visual Studio 2026 18.3 Released

News about a new Visual Studio release is always worth skimming because tooling updates affect everyone immediately.

Swagger UI: Architecture, Configuration, and Enterprise Implementation Guide

Swagger UI implementation guidance is useful when teams need consistent, shareable API docs rather than ad hoc setup.

Observability in .NET with OpenTelemetry

OpenTelemetry in .NET is one of the most practical observability topics right now, especially for distributed systems.

Beyond HTTP: Timer, Queue, and Blob Triggers

Beyond HTTP triggers, Azure Functions gets more interesting when timer, queue, and blob events enter the picture.

Light up Multiple Databases with a Single API with Data API builder's multi-source configuration

Data API builder’s multi-source support is notable if you want one API over multiple databases without writing all the plumbing.

LINQ in C#: Understanding the Select() Operator

Select() looks simple, but the article reminds you how much projection shapes your query behavior and data flow.

Creating standard and "observable" instruments: System.Diagnostics.Metrics APIs - Part 3

Metrics APIs are easy to overlook until you need real instrumentation, which makes this a valuable practical series entry.

Claude Sonnet 4.6 in Microsoft Foundry-Frontier Performance for Scale

Claude Sonnet in Microsoft Foundry is noteworthy for teams experimenting with frontier models inside the Azure ecosystem.

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