---
title: "dotInsights | October 2026"
description: "The dotInsights newsletter from JetBrains collects recent .NET and software development articles for developers. Topics include C# 15 collection expression arguments, union serialization with System.Text.Json, and control flow obfuscation for .NET and Java teams. Several posts focus on ASP.NET Core, covering middleware, RAG integration, and using passkeys for second factor authentication. The newsletter also features discussions on event-driven architecture versus CRUD over pub/sub and the impact of AI on database schema design. JetBrains announces the Rider 2026.2.3 release and explains how Microsoft helped fix slow startup times for Rider and ReSharper."
---

# dotInsights | October 2026

[Jetbrains](https://yomu.fyi/company/jetbrains) · Rachel Appel · Oct 5, 2026

**Type:** Announcement

## Summary

The dotInsights newsletter from JetBrains collects recent .NET and software development articles for developers. Topics include C# 15 collection expression arguments, union serialization with System.Text.Json, and control flow obfuscation for .NET and Java teams. Several posts focus on ASP.NET Core, covering middleware, RAG integration, and using passkeys for second factor authentication. The newsletter also features discussions on event-driven architecture versus CRUD over pub/sub and the impact of AI on database schema design. JetBrains announces the Rider 2026.2.3 release and explains how Microsoft helped fix slow startup times for Rider and ReSharper.

## Takeaways

- The System.Threading.Interlocked class provides atomic operations on shared variables for safe multi-threaded updates without a lock.
- JetBrains explains why Rider and ReSharper were slow to start and how Microsoft helped fix the problem.
- The newsletter includes articles on C# 15 collection expression arguments, union serialization, and control flow obfuscation for .NET and Java teams.

**Tags:** [JetBrains](https://yomu.fyi/topic/jetbrains), [.NET](https://yomu.fyi/topic/dotnet), [Rider](https://yomu.fyi/topic/rider)

- Source: [Jetbrains](https://blog.jetbrains.com/dotnet/2026/10/05/dotinsights-october-2026)
- Source URL: https://blog.jetbrains.com/dotnet/2026/10/05/dotinsights-october-2026
- Ingested by Yomu: 2026-10-05T18:00:13.764Z

[Read original post](https://blog.jetbrains.com/dotnet/2026/10/05/dotinsights-october-2026)