We’ve released version 2026.2.2 of ReSharper, Rider, and .NET tools. You can install this update from inside the tools themselves, through the Toolbox App, or on our website. Here’s what’s new in this update. Rider 2026.2.2 AI Agent Setup widget We’ve recently added a wide range of features to help you work with coding agents […]
When we launched ReSharper’s out-of-process (OOP) architecture, users reported slower startup times for IDEs using ReSharper on Windows. After profiling, the cause surprised us: Microsoft Defender was scanning our process for longer than we expected. This post is about what we found, what we learned working with Microsoft, and a tool we built that allows […]
Did you know? Fun fact: The C# compiler (Roslyn) is open source and written in C#. It exposes APIs to analyze and generate code. Welcome to dotInsights by JetBrains! This newsletter is the home for recent .NET and software development related information. 🔗 Links Here’s the latest from the developer community. ☕ Coffee Break Take […]
The first Early Access build for Rider 2026.3 is now available! It includes rainbow brackets, an easier way to set data breakpoints, a new Game Development plugin category, and filters in code completion. You can get the build from our website or through the Toolbox App. Here’s a look at what’s new. Rainbow brackets: You […]
Every game starts with an idea. Getting it into production means navigating code, tools, pipelines, performance bottlenecks, architectural trade-offs, and all the small decisions that only reveal their consequences once a project begins to scale. On September 28, JetBrains GameDev Day returns with a full day of practical talks for people building games, engines, tools, […]
We traced a frontier model through fifteen C# refactoring tasks and counted what it reached for. It piped text into interactive commands 468 times. It called git 422 times and sed 392 times. It ran dotnet build 163 times. Across 2,513 tool calls it performed a structural refactoring operation exactly zero times. Not because it […]
Our first minor update for the 2026.2 release cycle is ready to download. Here’s what’s new. Rider Rider 2026.2 put AI-assisted development front and center, and v2026.2.1 keeps that momentum going: The refactoring-code skill, bundled in JetBrains Rider Median task time before: 157.9s → after: 26.6s 83% faster Cost per solved task before: USD 0.52 […]
A free, online event for the .NET community. JetBrains .NET Day Online 2026 takes place on Wednesday, October 7. Expect a day of practical talks, live demos, and real-world lessons from community speakers and the JetBrains .NET team. Two things are different this year. The event was two days last time, while this year it’s […]
With the rapid rise in agent-first development, many developers are adopting AI-first editors like Cursor, Google Antigravity IDE, Devin Desktop, and Kiro into their workflows. The appeal is obvious: deep, contextual AI assistance integrated directly into the coding surface. But if you write C# and .NET for a living, you have probably hit a massive […]
Did you know? Ever wondered why C# uses the semicolon to terminate a statement? Obviously it comes from the C/C++ heritage it shares with other languages like Java, but where did C get it from? That would be Algol, where the semicolon was used to separate statements. But why the semicolon? In natural language grammar, […]
As .NET developers, we need to iterate on our applications while building, and part of that developer inner loop is the debugging experience. The rise of multi-platform code editors further requires developers to have all the functionality they need to build and debug their application out of the box, wherever they’re coding. Previously, .NET developers […]
ReSharper C++ 2026.2 is out, bringing initial support for C++26 reflection, the most anticipated addition to the C++ language in recent years. This release also introduces ACP agent support in ReSharper with Junie as the first available agent, adds support for the ISPC language, and significantly speeds up indexing in Unreal Engine projects. Other highlights […]
Rider 2026.2 opens up the IDE’s own intelligence to your AI coding agents, so they work from real project knowledge instead of reconstructing it from files and terminal output. A new set of agent skills covers testing, profiling, refactoring, and official Microsoft .NET workflows, and GitHub Copilot now joins the lineup as a natively integrated […]
ReSharper 2026.2 takes the first step toward ACP-based agent support in Visual Studio, starting with Junie in Preview. This is the beginning of an open AI ecosystem for .NET developers: your choice of agents and models, connected through a single protocol, paired with the code intelligence ReSharper is known for. The release also extends ReSharper’s […]
The Rider 2026.2 Release Candidate is ready for you to try. This upcoming release opens the IDE’s own intelligence to your AI coding agents, brings GitHub Copilot in natively, and delivers a wave of performance gains across both .NET and game development. Rider 2026.2 makes debugger launch and branch switching noticeably faster, speeds up Unreal […]
The ReSharper 2026.2 Release Candidate is ready for you to try. This release takes the first step toward ACP-based agent support in Visual Studio, starting with Junie in Preview, and sharpens everyday C# development with better analysis, refactoring, and .editorconfig integration. It also brings broader tool support in Out-of-Process mode and continued C++ language work. […]
JetBrains GameDev Day is back! Join us online on September 28, 2026, for a day dedicated to game development, practical engineering, tools, workflows, and the people building games across the world. We’re looking for speakers who are excited to share their knowledge, experience, lessons learned, tools, or creative approaches with the gamedev community. About GameDev […]
The last couple of months have been busy ones for ReSharper across VS Code and compatible editors. Between the 2026.1 and 2026.2 releases, we’ve been steadily sharpening the everyday .NET experience – from tracing how your data flows, to navigating call chains, to keeping your project structure front and center. This post is a tour […]
For over a year, the most consistent question from our users and community has been clear: When will the ReSharper extension support debugging? We heard you. And with the 2026.2 release, the first version of the debugger is now live. Built on the same core debugging engine that powers JetBrains Rider, this implementation is optimized […]
For over a year, the most consistent question from our users and community has been clear: When will the ReSharper extension support debugging? We heard you. And with the 2026.2 release, the first version of the debugger is now live. Built on the same core debugging engine that powers JetBrains Rider, this implementation is optimized […]
Did you know? The using keyword has two completely different meanings. You can use it to import classes from different namespaces at the top of a file, or to ensure deterministic cleanup in a method body. It’s not the only keyword that has multiple meanings. See how many you can think of. Welcome to dotInsights […]
If you’ve ever debugged your own C++ containers, strings, or hash tables on Linux or macOS, you know the deal: to see anything useful in the debugger, you have to write a custom data formatter. And writing a good data formatter is genuinely painful. Often, the formatter ends up longer and harder to follow than […]
Here’s a case worth pondering: your app freezes for ten seconds, and you ask an AI agent what’s wrong. What does it actually do? For a long time the honest answer was: it rummages through your code and takes a wild guess. A snapshot taken by a profiler tool is runtime evidence. It knows exactly […]
Every developer has tools they rely on daily. The workflows they’ve built around them, the ways they’ve learned to move faster, debug smarter, and write better code – that kind of hands-on experience can be hard to put into words. We’re collaborating with LinkedIn to make it easier for you to showcase your expertise with […]
Did you know? The var keyword isn’t a keyword! It’s one of several “contextual” keywords in C#, and it only has special meaning when used to declare a variable. Try defining a class called var and see what happens to the rest of your codebase… Welcome to dotInsights by JetBrains! This newsletter is the home […]
Rider 2026.2 EAP 5 is now available, bringing a faster startup flow with the new non-modal Welcome screen and quality-check hooks for AI agents. If you’re catching up on the 2026.2 EAP cycle, be sure to check out the blog posts we’ve already published about other updates unveiled so far, including WPF Hot Reload, the […]
WPF Hot Reload is now available in Rider, starting with the 2026.2 EAP 2 build. You can edit your XAML while your app is running under the debugger and see the changes immediately, with no rebuild, no restart, and no losing your place in the application. Together with the C# Hot Reload support that’s already […]
dotMemory Unit has long served as a unit testing framework for detecting memory issues in .NET code. We are grateful to everyone who has used it as part of their development and testing workflows. After careful consideration, we have decided to retire dotMemory Unit. The project will no longer receive active maintenance, compatibility updates, or […]
When you ask an AI agent to write a new feature, a good agent will eventually say: “I need to write a test for this.” But what happens next is usually messy. To figure out where that new test belongs, the agent has to start searching through your project. It might scan file names, inspect […]
JetBrains Rider 2026.2 EAP 3 is out! You can download this version from our website, update directly from within the IDE, use the free Toolbox App, or install it via snap packages. Here’s what you can expect from this update: New AI agent skill to reduce token use for test generation We’re also experimenting with […]