UPDATE: The calendar is full. You can sign up to be an alternate, in case someone drops out or fails to deliver. I can't give you a date though, so you'd essentially have to have a post ready to go as soon as December 1st. And please, don't let the lack of an advent date keep you from writing that C# blog post! Finally, due to the tremendous response, I will double up the slots next year (from 25 to 50), assuming this advent goes well :)

I heard about the F# Advent Calendar, a traditional that's been carried on since 2010 (2014 in English). I think this is a great idea, and there needs to be one for C# too!

(I asked Sergey Tihon for permission!)

So, I need you to write a C# blog post!

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 a blog post (in English).
3. Add a link in your blog post that links back to here, so that your readers may find the entire advent.
4. Publish your blog post on the specified date. Your post 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. Post the link to your post on Twitter with hashtags #csharp and #csadvent

Below are all the slots, and who has claimed each date. I chose to go with 25 total slots (yes I know some advent calendars are 24).

I will do my best to keep this up to date. The slots will be first come first serve. I have already claimed December 25th for myself, since I assume that will be the least desirable date. But I'm happy to swap if you really really want that day.

Date	Claimed by	Blog Post
Dec 1, 2017	Hilary Weaver-Robb	Combining Integration and UI Automation in C#
Dec 2, 2017	Jamie Rees	Open Source, 2 years retrospective
Dec 3, 2017	Lucas Lansky	Analyzing unit-ness of white-box tests using OpenCover
Dec 4, 2017	Andrei Ignat	AOP with Roslyn–part 3–custom code at beginning of each method
Dec 5, 2017	Baskar rao Dsn	Quick Actions in Visual Studio 2017
Dec 6, 2017	Bill Sempf	Coding for an encrypted service
Dec 7, 2017	Brant Burnett	Who says C# interfaces can't have implementations?
Dec 8, 2017	Lee Englestone	Creating Alexa Skills with Web-API and hosting on Microsoft Azure
Dec 9, 2017	James Hickey	Deck the Halls With Strategy Pattern Implementations in C#: Basic to Advanced
Dec 10, 2017	Carl Layton	Using C# dynamic Keyword To Replace Data Transfer Objects
Dec 11, 2017	James Curran	An Exercise in Refactoring - Specification Pattern
Dec 12, 2017	Andrew Lock	Creating a .NET Standard Roslyn Analyzer in Visual Studio 2017
Dec 13, 2017	Jonathan Danylko	5 More C# Extension Methods for the Stocking! (plus a bonus method for enums)
Dec 14, 2017	Gérald Barré (aka Meziantou)	Interpolated strings: advanced usages
Dec 15, 2017	Baskar rao Dsn	Using BenchMarkDotNet for Performance BenchMarking
Dec 16, 2017	Chris Bohatka	Breaking Down Dependency Injection and Inversion of Control in C# with SimpleInjector
Dec 17, 2017	David Pine	C# Special Edition
Dec 18, 2017	Barret Blake	Using C# and Azure Cognitive Services Text Analytics to Identify and Relate Text Documents
Dec 19, 2017	Ed Charbeneau	5 .NET Standard Features You Shouldn’t Miss
Dec 20, 2017	Kevin Miller	Things you Should do with Strings While You’re Coworkers are on Holiday and No One is Checking the Production Code Branch
Dec 21, 2017	Angus Kinsey	What makes C# great?
Dec 22, 2017	Jim Wilcox	Unloading the UI Thread in C# on Windows 10 + UWP
Dec 23, 2017	Duane Newman	All I want for Christmas is a C# Build System
Dec 24, 2017	Calvin Allen	Live Unit Testing in Visual Studio 2017
Dec 25, 2017	Matthew D. Groves	Swashbuckle and Swagger with ASP.NET Core

Alternates:

• Leave a comment or tweet with #csadvent to be put on this list!

Some ideas:

1. Introduction to [your favorite NuGet package]
2. X C# Tricks and Tips
3. JSON (De)serialization
4. Streams
5. The newer C# 6 and 7 features
6. Async/await

Thanks to everyone who is participating! I hope this goes well and it can become an annual tradition.