It’s a common question, “Where do I put validation?” Simple answer: put it where it’s needed. But it’s not just a question of “where”, but of “when”, “what” and “why”. If we treat our entities as data ...

One of the keys to having maintainable tests are to make sure that tests are isolated and reproducible. For unit tests, this is easy as long as we stay away from global variables, static classes and ...

13 October, 2016. It was a Thursday. A while ago, I blogged about using MediatR to build a processing pipeline for requests in the form of commands and queries in your application. MediatR is a ...

Don’t Do Role-Based Authorization Checks; Do Activity-Based Checks 24 May, 2011. It was a Tuesday.

12 August, 2008. It was a Tuesday. A question came up on the ALT.NET message board asking whether Value Objects should be used across service boundaries. Of course, the conversation took several ...

I found the Motivator this morning. It lets you create your own motivational pictures. So, here’s my first run at creating the SOLID software development principles in motivational picture form. I ...

Dependency Injection Is NOT The Same As The Dependency Inversion Principle 22 September, 2011. It was a Thursday.

Design patterns often differ only in semantics and intent. That is, the language used to describe the pattern is what sets it apart, more than an implementation of that specific pattern. It often ...

21 October, 2011. It was a Friday. Hello all, it’s been a while since I have blogged anything, been extremely busy with personal events in my life. So to get back into the swing of things I am going ...

20 June, 2016. It was a Monday. In Part 1 of this 2-part series, I walked through some lessons learned from the first incarnation of our project. The original project I’d still qualify as a success, ...

2 August, 2008. It was a Saturday. Nate Kohari (whose primate brain is far too small to comprehend this post [inside joke, he’s actually really sharp]) was asking on Twitter today about how to ...

Services are first-class citizens of the domain model. When concepts of the model would distort any Entity or Value Object, a Service is appropriate. From Evans’ DDD, a good Service has these ...