The .NET News Daily Issue #359

Your Daily Dose of .NET Insights, Tools, and Trends

Jasen Fici
December 31, 2025

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Today's Articles

“Object Cannot Be Cast from DBNull to Other Types” — The Hidden Null Trap in .NET 8 / 9

https://medium.com/@induwarafernando9/object-cannot-be-cast-from-dbnull-to-other-types-the-hidden-null-trap-in-net-8-9-05c1b8c87966?source=rss------dotnet-5

If you’ve worked long enough with .NET and SQL, this one probably found you eventually:

Partial Constructors in C# 14 (.NET 10) - A Game-Changing Feature

https://www.c-sharpcorner.com/article/partial-constructors-in-c-sharp-14-net-10-a-game-changing-feature/

C# 14 introduces Partial Constructors, a game-changer for .NET 10! Split constructor logic across files, enhance source generator support, and improve maintainability. Build modular, scalable applicat...

ASP.NET Development Services: Building Secure, Scalable, and High-Performance Web Applications

https://medium.com/@sinhaabhishekkumar57/asp-net-development-services-building-secure-scalable-and-high-performance-web-applications-f11a355e225d?source=rss------dotnet-5

In today’s rapidly evolving digital landscape, businesses require web applications that are not only visually appealing but also secure…

.NET Framework vs .NET Core — Key Differences Every Developer Should Know

https://medium.com/@sachinghadi/net-framework-vs-net-core-key-differences-every-developer-should-know-2a2bcdc158f6?source=rss------dotnet-5

Choosing the right .NET platform matters. Here’s a quick breakdown 👇

Building AI-Ready Applications with Model Context Protocol in C#

https://medium.com/@adrianbailador/building-ai-ready-applications-with-model-context-protocol-in-c-2783ff41b759?source=rss------dotnet-5

Learn how to build MCP servers and clients in C# using the official SDK, and connect your .NET applications with AI models in a standard…

Practical Experience: Migrating an Old .NET Project with GitHub Copilot Agent

https://medium.com/@pabasaramahindapala/practical-experience-migrating-an-old-net-project-with-github-copilot-agent-cb564b6688fe?source=rss------dotnet-5

Learn how GitHub Copilot Agent helped migrate a .NET CQRS project to MediatR with async/await support with unit tests

Task.Delay fails if you wait longer than 49.7 days

https://steven-giesel.com/blogPost/c3bdad0d-f9eb-4dcf-b650-98ec0f5dd4d4

Task.Delay fails if you wait longer than 49.7 days. So something like: await Task.Delay(TimeSpan.FromDays(50)); will fail. But why and should you care?

Visual Studio “View” Menu — What’s Actually Useful (And What Can Wait)

https://medium.com/@sweetondonie/visual-studio-view-menu-whats-actually-useful-and-what-can-wait-5ff7f0b63750?source=rss------dotnet-5

If you open the View menu in Visual Studio, it feels overwhelming.

What’s New in C# 14 (.NET 10): 7 Powerful Language Features Every C# Developer Should Know

https://www.c-sharpcorner.com/article/whats-new-in-c-sharp-14-net-10-7-powerful-language-features-every-c-sharp-developer-s/

Explore C# 14's powerful features in .NET 10! Boost productivity with extension members, extension operators, field keyword, null-conditional assignment, and more. Write cleaner, safer, and faster cod...

Introducing Microservices Design Patterns in .NET (2nd Edition)

https://www.trevoirwilliams.com/introducing-microservices-design-patterns-in-net-2nd-edition/

After months of writing, revising, and pressure-testing ideas against real-world systems, I’m excited to officially announce the release of the Second Edition of Microservices Design Patterns in .NET....

The best VS Code feature you aren't using

https://www.youtube.com/watch?v=OqzC9b3ueX0

How to Fix Slow LINQ Queries: Real Performance Lessons from Real Projects

https://blog.stackademic.com/how-to-fix-slow-linq-queries-real-performance-lessons-from-real-projects-a13e6fc03410?source=rss------dotnet-5

A guide to understanding and fixing common LINQ performance pitfalls — with real examples and measurable improvement Continue reading on Stackademic »

Understanding and Managing Mark of the Web in .NET

https://www.meziantou.net/understanding-and-managing-mark-of-the-web-in-dotnet.htm

What is Mark of the Web? Mark of the Web (MOTW) is a Windows security feature that protects users from potentially unsafe files downloaded from the internet. When you download a file, Windows automati...