Please be aware, this meetup is **in-person only**, we won't run a livestream, but we will do our best to record the sessions and provide them afterwards. Please only RSVP if you intent to attend in person in Amsterdam. If you want to be made aware of when the recording is published follow us on [YouTube](https://youtube.com/@dotnetamsterdam) or [BlueSky](https://bsky.app/profile/dotnet.amsterdam).

We would like to thank our sponsor/host [JetBrains ](https://www.jetbrains.com/)for making this event possible.

**Schedule:**
18:00 doors open
18:00 - 18:45 walk-in, food & drink
18:45 - 19:00 welcome & introduction
19:00 - 20:00 Sander ten Brike - The best ways to use the latest open api features in .NET9
20:00 - 20:15 short break / socializing
20:15 - 21:00 Corniel Nobel - Single Value Objects: where DDD and Functional Programming share forces
21:00 - 21:45 socializing
21:45 doors closing

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**The best ways to use the latest open api features in .NET9**

.NET 9 makes some impactful changes for creating .NET applications with OpenAPI support! In this session, we’ll dive into the breaking changes and latest OpenAPI advancements for .NET 9 and explore how these features can be leveraged to create robust, efficient, and well-documented APIs. We will cover both minimal API's and controllers.

Afterwards, we'll also talk about Kiota, a new API client generator from Microsoft, and how it can be used to generate API clients based on an OpenAPI document.

This presentation will feature lots of demos with the aim of giving you an end-to-end experience of the latest and greatest features of OpenAPI in .NET 9 and how this can be used with OpenAPI tooling to generate and use API clients!

By **Sander ten Brike**
Lead Software engineer @ Arcady \| Microsoft MVP

Sander ten Brinke is a Microsoft MVP and Lead Software Engineer at Arcady, a Dutch IT consultancy firm based in Zwolle. He loves working with .NET, Azure, CI/CD and a whole lot more. He always stays up to date with all new technology and loves sharing his knowledge with everyone!

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**Single Value Objects: where DDD and Functional Programming share forces**

Most developers have the habit of reusing primitives for everything. This phenomenon, known as primitive obsession, leads to unclear code and (API) contracts, and eventually to bugs.

By creating single value objects (value objects that are a subset of one primitive) we can overcome that, and by doing so, we apply the lessons learned from Domain-Driven Design and Functional programming.

By **Corniel Nobel**
Software Architect @ TJIP
I'm an energetic, passionate, creative, intrinsic motivated software engineer, evangelist and architect who's in the business since the early 2000's.

Software engineering should not just be your job, but your lifestyle. And the truth should be in the code, not in dreadful documents and diagrams.

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.NET & Azure / dotnet Amsterdam meetup

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best ways to use latest open API features in .NET9 & Single Value Object

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.NET & Azure / dotnet Amsterdam meetup

best ways to use latest open API features in .NET9 & Single Value Object

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