Skip to main content

What is the C# Advent?

The C# Advents in 2018 and 2017 were so much fun. It's now time to sign up for 2019.

Just like last year, each day of the Advent calendar will have up to TWO blog posts. That means that there is a maximum of FIFTY slots! So, tell your C# friends and let's fill up this calendar.

A little history: I heard about the F# Advent Calendar, a tradition that's been carried on since 2010 (2014 in English). I think this is a great idea, and so I organized one for C#! (I asked Sergey Tihon for permission!). If you are running other developer advent calendars, just let me know and I will link to them here:

Let's Get Started

I need you to write a C# blog post, create a video, write an article, etc.

Here are the rules:

  1. Reserve a slot on Twitter (with hash tag #csadvent) or leave a comment on this post. You do not have to announce your topic until the day you reserve.
  2. Prepare your content (in English).
  3. Add a link in your content that links back to here, so that your readers may find the entire advent. You can host your content anywhere you'd like: your own site,, hackernoon, medium, wordpress, youtube, dzone, etc.
  4. Publish your content on the specified date. Your content must be related to C# in some way, but otherwise the content is completely up to you. I've posted a few ideas below to get your creativity flowing.
  5. Share your post on Twitter with hashtags #csharp and #csadvent

Below are all the slots, and who has claimed each date.

I will do my best to keep this up to date. The slots will be first come first serve. I also allowed last year's authors to get first crack. I will claim the last remaining spot for myself. I will prepare a post just in case someone has to drop out.

DateClaimed byContent
Dec 1, 2019 Brant Burnett Simon Painter  IAsyncEnumerable Is Your Friend, Even In .NET Core 2.x Hacking C#: Programming for the Truly Lazy
Dec 2, 2019 Luis Antonio Beltran Chris Ayers 2FA with Twilio Authy and C# (special guest: Xamarin) Dependency Injection, Architecture, and Testing
Dec 3, 2019 Kelson Ball Morgan Kenyon An Example of Partial Function Application in C# The Difference Between IEnumerable and IQueryable Explained
Dec 4, 2019 Ryan Overton Carl Layton Default Interface Methods in C#: Love 'em or Hate 'em? The Outbox Pattern in C#
Dec 5, 2019 Dave Cook Manuel Grundner To Null, or not to Null?!? The journey of porting pretzel to .NET Core
Dec 6, 2019 Lukáš Lánský Simon Timms Coverage-Driven Test Selection Machine Learning for Boring Applications
Dec 7, 2019 Chase Aucoin Kendall Miller Aurora Serverless with Entity Framework Core Better String Formatting with String Interpolation
Dec 8, 2019 Matt Eland Jeremy Sinclair Experimental C# with Scientist .NET Creating a Simple Wizard Component with Blazor
Dec 9, 2019 Meziantou Cecilia Wirén Thread-safe observable collection in .NET Overflow on integers - count with this security risk!
Dec 10, 2019 Andrew Lock James Hickey .NET Core, Docker, and Cultures - Solving a culture issue porting a .NET Core app from Windows to Linux Modular Monoliths And Composite UIs With .NET Core Razor Class Libraries
Dec 11, 2019 DotNetCoreShow Roman Stoffel The .NET Core Podcast - Episode 40 - Noda Time with Jon Skeet C# Loves Code Patterns
Dec 12, 2019 Brian Jackett James Curran Creating a C# Azure Function to Call Microsoft Graph Cleanup Scaffolded Code with modelbuild
Dec 13, 2019 Barret Blake Ed Charbeneau, Daniel Roth, Chris Sainty, Egil Hansen The Nightmare Before Blazor Getting Started with Blazor: All There is to Know From the Experts
Dec 14, 2019 Benjamin Howarth Martin Zikmund   A Christmas C# riddle
Dec 15, 2019 Jonathan Danylko Hilary Weaver-Robb 10 More Useful C# Extension Methods for 2019 Refactoring RestSharp Sample Tests to Make Them More Maintainable
Dec 16, 2019 Shahed Chowdhuri Ian Bebbington ASP .NET Core code sharing between Blazor, MVC and Razor Pages The Seven GUIs of Christmas
Dec 17, 2019 Joe Zack Chris Sainty Streaming process output to a browser, with SignalR and C# Introduction to Blazor Component Testing
Dec 18, 2019 Garo Yeriazarian Stuart Turner Vertically Sliced Command Line Tools in C# and .NET Core 3.1 Improving Code Readability with Linq (and MoreLinq)
Dec 19, 2019 Baskar Rao Stephen Lorello How to use Subscriptions in GraphQL C# Santa’s Nexmo Helper
Dec 20, 2019 Andrea Angella Layla 15 reasons why you should learn C# in 2020 Get off the naughty list with Twilio Autopilot, Azure Functions and Table Storage
Dec 21, 2019 Muhammad Azeez Patrick Lioi How do Object Relational Mappers (like Entity Framework) work? Patterns for using Entity Framework in C# 8
Dec 22, 2019 James Bender Eric Potter Refactoring for Testability – A Christmas Miracle! C# Strings with Ranges, and Indexes
Dec 23, 2019 Andrew Craven Lee Englestone Microservices and Outside-in Tests Using C# and Docker Compose Compiling Code without Visual Studio
Dec 24, 2019 Thomas Carpe Azmat Ullah Khan   PDF Digital Signatures with Itext7, Bouncy Castle and .NET Core
Dec 25, 2019 Mike Jolley Calvin Allen Adding HATEOAS to an ASP.NET Core API C# 8 is old news. Onward, to C# 9!


  • IF ALL FIFTY SLOTS FILL UP, please leave a comment or tweet with #csadvent anyway and I'll put you on this standby list:
  • Standby list:
    • Myself.
    • You, if you want to be.

Some ideas/topics to help inspire you:

  1. Blazor - C# for the browser
  2. Your latest open source contribution - show the community how you contributed and why
  3. Your favorite C# language feature - it doesn't even have to be a new feature, just blog about something you love about C#
  4. Introduce your favorite NuGet package / library. Even if it's a library you take for granted, not everyone has heard about it.
  5. How to avoid a pitfall you found with performance/memory/etc
  6. Integration/deployment of a C# application with Jenkins, Docker, Kubernetes, TeamCity, Azure, etc
  7. Write a "how to" for one of the many tools discussed in an episode of the Cross Cutting Concerns podcast or the DotNetBytes podcast
  8. Interview someone about C# and post the audio or a transcript.
  9. Implement a simplified example of a design pattern in C#

Thanks to everyone who is participating!

If you were an author of a C# Advent blog post in 2018, you get a chance to sign up earlier than the general public.

Tweet #csadvent or leave a comment below with the date you want to blog on. Each day has up to TWO slots. If someone has already claimed the day you want, that day may still be available.

The general call for C# Advent authors will go out soon, so please claim your dates as soon as possible. Just like last year, you do NOT have to pick a topic right now. If you DO want to pick a topic, I will pencil it in, but you are free to change it at any time up until the date you pick.

This is a special crossover episode with Remember When, hosted by Steve Fischer and Scott Wood.

Show Notes:

Dennis Stepp is prioritizing tests based on risk.

This episode is not sponsored! Want to be a sponsor? You can contact me or check out my sponsorship gig on Fiverr

Show Notes:

Want to be on the next episode? You can! All you need is the willingness to talk about something technical.

Arlene Andrews talks about good online learning resources.

This episode is not sponsored! Want to be a sponsor? You can contact me or check out my sponsorship gig on Fiverr

Show Notes:

Want to be on the next episode? You can! All you need is the willingness to talk about something technical.

Matthew D. Groves

About the Author

Matthew D. Groves lives in Central Ohio. He works remotely, loves to code, and is a Microsoft MVP.

Latest Comments