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C# Advent Two C# posts a day, December 1–25

C# Advent 2025

48 posts from December 1 to December 25, 2025.

Read the look back at 2025

1 December
- Post 1
  From Encrypted Messaging to Secure AI: Cryptography Patterns in .NET 10
  by Christopher C. Johnson
- Post 2
  Reducing Bugs by Using the Model View Update Pattern
  by Cameron Presley
2 December
- Post 1
  Create Types on Demand and Cecilifier
  by Roman Stoffel
- Post 2
  Creating a custom MSBuild SDK to reduce boilerplate in .NET projects
  by Gérald Barré
3 December
- Post 1
  Fetching GitHub content from C#
  by Thomas Ardal
- Post 2
  Santa's Workshop with AI Elf Agents
  by Lee Englestone
4 December
- Post 1
  Debug Dumps in Visual Studio
  by Stephen Cleary
- Post 2
  Single File Test Suites in .NET C#
  by Ardalis
5 December
- Post 1
  Gifting SDKs with Kiota
  by Victor Frye
- Post 2
  .NET Performance: Efficient Async Code
  by Mykyta Kovalenko
6 December
- Post 1
  St. Nicholas' Goodies - A TUI!
  by Sarah Dutkiewicz
- Post 2
  No post
7 December
- Post 1
  Parsing Santa's workshop with strongly typed data (without the coal)
  by Dave Brock
- Post 2
  Debugging Entity Framework Core: 8 Real-World Query Anti‑Patterns (and How to Fix Them)
  by Chris Woody Woodruff
8 December
- Post 1
  A Christmas Trivia game using C# and Spectre.Console
  by Michael Eaton
- Post 2
  Make Copilot Work Your Way: Building MCP Servers in C#
  by Al Nyveldt
9 December
- Post 1
  Reusing Your Existing .NET REST APIs for AI with MCP
  by Jonathan "J." Tower
- Post 2
  What's New in C# 14: Extension Members
  by Kevin Griffin
10 December
- Post 1
  Meet Microsoft Agent Framework — Your .NET Agent Toolkit
  by Luis Beltran
- Post 2
  Create your MCP Server using Azure Functions
  by Jorge Levy
11 December
- Post 1
  2 code a Roslyn Source Generator - C# Advent Calendar 2025
  by 2code ^ !2code
- Post 2
  Sending sweet treats with Google Pub/Sub
  by Poornima Nayar
12 December
- Post 1
  Modern .NET with Uno Platform & AI
  by Sam Basu
- Post 2
  Getting Started with the Aspire CLI
  by Chris Ayers
13 December
- Post 1
  Sending Holiday Cheer in .NET with Scriban and MailKit
  by John Waters
- Post 2
  C# Advent 2025 - Extension Members
  by Barret Blake
14 December
- Post 1
  16 Tips for Writing AI-Ready C# Code
  by Matt Eland
- Post 2
  Dynamically Changing Decimal & Thousand Separators At Runtime
  by Conrad Akunga
15 December
- Post 1
  Sentiment Analysis in C#: Azure AI Language or LLMs
  by Rodrigo Juarez
- Post 2
  TUnit: The New Sheriff in Town for .NET Testing
  by Vladan Petrovic
16 December
- Post 1
  Manufacturing Certainty: Load Testing With Azure Load Testing
  by Andy Wilson
- Post 2
  EF Core 10 Turns PostgreSQL into a Hybrid Relational-Document DB
  by Stefan Mitic
17 December
- Post 1
  Your cache is not protected from cache stampede
  by Alexey Fedorov
- Post 2
  Building a Fibonacci Sphere Visualizer with AI in the Loop
  by Matt Mattei
18 December
- Post 1
  From Spec to Santa: My C#‑Powered Christmas Story Generator Experiment
  by Alexandre Nédélec
- Post 2
  How to create and access custom C# Attributes by using Reflection | Code4IT
  by Davide Bellone
19 December
- Post 1
  Building an AI-Powered Form Assistant with Blazor
  by Ed Charbeneau
- Post 2
  Agent orchestration with Microsoft Agent Framework.
  by Sam Gomez
20 December
- Post 1
  Getting Started with Couchbase Enterprise Analytics SDK
  by Jeffry Morris
- Post 2
  Bringing the DOOM to Uno Platform
  by Martin Zikmund
21 December
- Post 1
  The Monads Were Here the Whole Time!
  by Simon Painter
- Post 2
  Over the River and Through the Woods
  by Tim Purdum
22 December
- Post 1
  No post
- Post 2
  Api Versioning
  by Irina Dominte(Scurtu)
23 December
- Post 1
  The .NET Cross-Platform Showdown: MAUI/WinUI vs Uno vs Avalonia (And Why Avalonia Won)
  by Aaron LaBeau
- Post 2
  Santa's AI Chat App
  by Kyle McMaster
24 December
- Post 1
  Evolving Intelligence: Evolutionary Algorithms and Neural Networks in C#
  by Piotr Kolodziej
- Post 2
  Mastering Deployment: An Easy Guide About Modern Docker Workflow for .NET 10
  by Santhosh Reddy Vootukuri
25 December
- Post 1
  Creating Your Own MSBuild SDK - It's Easier Than You Think
  by Calvin A. Allen
- Post 2
  String Interning
  by Stefan Pölz