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Dennis Doomen @dennisdoomen.com · 29/09/2026

PackageGuard 2.8 adds gated policies so you can prevent your builds from succeeding based on a various quality, operation and security attributes. Read all about that at www.dennisdoomen.com/2026/09/pack...

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Dennis Doomen @dennisdoomen.com · 28/09/2026

Few conferences leave such a lasting impression as Techorama does, so I'm happy that, again, I'm playing a small part in their impressive line-up. To celebrate that, I can offer you a discount of 100 euros through tickets.techorama.nl/2026/redeem?... Will I see you there?

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Dennis Doomen @dennisdoomen.com · 17/09/2026

v2.7 of PackageGuard makes it easy to figure out why your codebase is using a specific NuGet or NPM package. It will show where in your project a particular package is used, which version was resolved and risks exists. Learn more about this at packageguard.org/docs/explain

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Dennis Doomen @dennisdoomen.com · 15/09/2026

Tomorrow, I'll be travelling to Oslo to speak at the renowned @ndcconferences.com. Although this is my 7th NDC, I remain humbled to be at the one that started it all. Will I see you there?

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Dennis Doomen @dennisdoomen.com · 14/09/2026

This evening, we've released Fluent Assertions 8.11. Check out the detailed release notes at github.com/fluentassert... #mvpbuzz #unittesting #assertions

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Dennis Doomen @dennisdoomen.com · 10/09/2026

PackageGuard, the fully open-source alternative to tools like Snyk, Black Duck and others, has just received an update that improves the risk report by removing overlapping risk factors and include all the vulnerabilities details. Also check out the new website at packageguard.org

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Dennis Doomen @dennisdoomen.com · 09/09/2026

Mockly, the open-source HTTP mocking library for .NET is getting better and better. Check out some of the newest features that got released over the weekend in the image below, or read the docs at mockly.org/docs/advance...

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Dennis Doomen @dennisdoomen.com · 08/09/2026

Pathy, the source-only .NET library that makes working with files and directories a very fluent experience, received a new version. Check it out at github.com/dennisdoomen...

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Dennis Doomen @dennisdoomen.com · 07/09/2026

Reflectify, a source-only open-source package with tons of Reflection smartness, got a new release. Check out the release notes at github.com/dennisdoomen... #mvpbuzz #dotnet #csharp #oss

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Dennis Doomen @dennisdoomen.com · 07/09/2026

When should a C# operation be a method rather than a property? Use a method if it’s expensive, performs a conversion, returns a different result each call, or causes side effects. Lazy-loading and internal caching are reasonable exceptions. #csharp #codingguidelines #codingconventions

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Dennis Doomen @dennisdoomen.com · 04/09/2026

My weekly Claude Team limit got reset halfway the week and will reset again tomorrow. Did that happen to anybody else?

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Dennis Doomen @dennisdoomen.com · 31/08/2026

Properties should be stateless with respect to other properties. Setting DataSource then DataMember should have the same result as the reverse. Sounds trivial, but I've seen plenty of classes where properties were anything but simple. #csharp #codingguidelines #classdesign #codingconventions

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Dennis Doomen @dennisdoomen.com · 31/08/2026

I've just burned through my 5-hour limit and 13% of my weekly limit in 38 minutes and I don't even understand what happened. Using Cloud Team and Sonnet 5.

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Dennis Doomen @dennisdoomen.com · 27/08/2026

PackageGuard, your totally free NuGet/NPM package scanning and risk reporting tool now supports generating a Software Bill Of Materials (SBom) in CycloneDX and SPDX format. Check out the documentation at github.com/dennisdoomen... Stay tuned for even more awesome features soon...

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Dennis Doomen @dennisdoomen.com · 27/08/2026

I always had a wish to replay "The Witcher 3", but that has now become a definitive plan.... www.youtube.com/watch?v=IGk1...

youtube.com

The Witcher 3: Wild Hunt — Remastered | Official Announcement Trailer

YouTube video by The Witcher

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Dennis Doomen @dennisdoomen.com · 25/08/2026

💡And for those that are concerned about the dependency hell. Reflectify ships as a source-only package. In other words, it compiles the code into your project without any visible binary dependencies.

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Dennis Doomen @dennisdoomen.com · 25/08/2026

Over the weekend, I've released Reflectify 1.10, a NuGet package that replaces all that hand-rolled Reflection code with battle-tested extension methods. Check out the release notes at github.com/dennisdoomen...

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Dennis Doomen @dennisdoomen.com · 25/08/2026

I love this new description of the term IDE in the age of AI #dotnetdaych

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Dennis Doomen @dennisdoomen.com · 20/08/2026

Looking forward to my first real .NET conference in Switzerland. And let's start the conference season on a high note with two talks in the same day. Will I see you there? #mvpbuzz #dotnetdaych

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Dennis Doomen @dennisdoomen.com · 17/08/2026

During the weekend, I've released Mockly 1.11, the new in-memory HTTP mocking library in town. This version allows you to simulate delayed responses or requests that throw exceptions. Check out the docs at mockly.org

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Dennis Doomen @dennisdoomen.com · 17/08/2026

If you love Band of Brothers like me and remember every scene episode by episode, check out this amazing reunion. www.youtube.com/watch?v=xMaM...

youtube.com

The Actors Roundtable | 25th Anniversary 'Band of Brothers' Symposium

YouTube video by The National WWII Museum

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Dennis Doomen @dennisdoomen.com · 14/08/2026

Want to learn more about high-quality software development? Check out csharpcodingguidelines.com

csharpcodingguidelines.com

Introduction

for all C# versions up to v14

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Dennis Doomen @dennisdoomen.com · 14/08/2026

Want to learn more about high-quality software development? Check out csharpcodingguidelines.com

csharpcodingguidelines.com

Introduction

for all C# versions up to v14

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Dennis Doomen @dennisdoomen.com · 14/08/2026

The 2026-2027 MVP ring has finally made it from the US. #mvpbuzz

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Dennis Doomen @dennisdoomen.com · 13/08/2026

We released Fallout 10.4—the first new version since Nuke was abandoned. Fallout replaces messy YAML pipelines with refactorable, debuggable, navigable C#. • Inspired by Make • Makes Azure DevOps → GitHub Actions migration easier • Used in my OSS & client projects

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Dennis Doomen @dennisdoomen.com · 12/08/2026

C# 12 primary constructors reduce boilerplate when capturing dependencies. Prefer when: ✅ Constructor only captures dependencies/config ✅ No complex initialization Avoid when: ✅ Validation or non-trivial initialization is needed #csharp #codingguidelines #classdesign

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Dennis Doomen @dennisdoomen.com · 10/08/2026

Prefer a single-method interface when state matters, the contract is strong (IDisposable, IEquatable), default interface methods help, or more members are likely soon. #codingstandards #csharp #codingguidelines #designpractices #bestpractices

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Dennis Doomen @dennisdoomen.com · 10/08/2026

An interface with one method is often just a named function signature. If it is not likely to grow, a delegate is simpler, more loosely coupled, and easier to test.

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Dennis Doomen @dennisdoomen.com · 06/08/2026

Want to learn more about high-quality software development? Check out csharpcodingguidelines.com

csharpcodingguidelines.com

Introduction

for all C# versions up to v14

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Dennis Doomen @dennisdoomen.com · 05/08/2026

Choosing between records and classes in C# matters! Records: data-focused, immutable, structural equality (DTOs, value objects) Classes: behavior-focused, mutable state, identity-based Record struct: small immutable values (stack allocation) Mix them and you've got a design problem. #CSharp

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Dennis Doomen @dennisdoomen.com · 05/08/2026

Want to learn more about high-quality software development? Check out csharpcodingguidelines.com

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Dennis Doomen @dennisdoomen.com · 04/08/2026

...that are used to transfer data over a communication channel, also called Data Transfer Objects, or a class that wraps several parameters of a method. For DTOs, consider using an immutable record type instead of a class to make the intent explicit. #csharp #codingguidelines #classdesign #

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Dennis Doomen @dennisdoomen.com · 04/08/2026

In general, if you find a lot of data-only classes in your code base, you probably also have a few (static) classes with a lot of behavior. Use the principles of object-orientation explained and move the logic close to the data it applies to. ⚠️The only exceptions to this rule are classes...

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Dennis Doomen @dennisdoomen.com · 29/07/2026

💡 Inversion of Control or Dependency Injection frameworks sometimes require exposing a dependency as a public property. If it's only used for dependency injection and nothing else, I wouldn't consider that a violation. #bestpractices #codingdesign #codingguidelines #csharp

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Dennis Doomen @dennisdoomen.com · 29/07/2026

By doing so, calling code becomes coupled to the underlying class you're using, making it harder to replace or refactor later. 💡 Fluent Interfaces may look like a violation, but they're simply returning themselves to enable method chaining, so they don't break the intent of the rule...

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Dennis Doomen @dennisdoomen.com · 29/07/2026

If you find yourself writing code like this someObject.SomeProperty.GetChild().Foo() ...then you may be violating the Law of Demeter. An object should not expose other classes it depends on, because callers may misuse that exposed property or method to access the object behind it...

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Dennis Doomen @dennisdoomen.com · 29/07/2026

Want to learn more about high-quality software development? Check out csharpcodingguidelines.com

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Dennis Doomen @dennisdoomen.com · 23/07/2026

...class. A less subtle example is not honoring the behavior expected by the base class. #bestpractices #codingdesign #codingguidelines #csharp

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Dennis Doomen @dennisdoomen.com · 23/07/2026

In other words, you should be able to pass an instance of a derived class wherever its base class is expected, without the callee knowing the derived class. A very notorious example of a violation of this rule is throwing a NotImplementedException when overriding methods from a base...

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Dennis Doomen @dennisdoomen.com · 21/07/2026

Did you know there's a great way to start building an (open-source) library in .NET that comes with everything you'd expect from a professional package? And did you know it supports GitHub and Azure DevOps? If not, check out github.com/dennisdoomen.... Version 1.9 was released over the weekend.

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Dennis Doomen @dennisdoomen.com · 16/07/2026

✅7 done 🎤5 to go Hope to see you after the summer... #mvpbuzz

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Dennis Doomen @dennisdoomen.com · 16/07/2026

Do you know organizations that use GitHub with Enterprise Managed Accounts and Data Residency. If so, why (not)?

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Dennis Doomen @dennisdoomen.com · 15/07/2026

Yes, and my 4th year as an MVP is in the pocket. #mvpbuzz

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Dennis Doomen @dennisdoomen.com · 14/07/2026

...IProvideClusterwideLock that describe what the interface does rather than what class implements it. #csharpguidelines #cleancoding #bestpractices

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Dennis Doomen @dennisdoomen.com · 14/07/2026

...to call or implement the interface related to a particular task. This rule is more commonly known as the Interface Segregation Principle. 💡Avoid taking the name of the class and slapping an "I" in front of it. Instead, consider using role-based names like IFetchSomething or...

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Dennis Doomen @dennisdoomen.com · 14/07/2026

Interfaces should have a name that clearly explains their purpose or role in the system. Do not combine many vaguely related members on the same interface just because they were all on the same class. Separate the members based on the responsibility of those members, so that callers only need...

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Dennis Doomen @dennisdoomen.com · 13/07/2026

Getting there was an adventure. A last-minute technical issue canceled my KLM flight at the gate. I picked up my luggage, got in the car, and drove to Berlin instead. That's how much I didn't want to miss this event.

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Dennis Doomen @dennisdoomen.com · 13/07/2026

The atmosphere at WeAreDevelopers is incredible. The energy starts with the opening session and keeps going until the end of the day. It's one of those events where you constantly run into interesting people and conversations.

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