C#

Extending WebAssembly to the Cloud with .NET

We're closely following the progress of WebAssembly, including WebAssembly System Interface (WASI). There's a new experimental workload in .NET 8 for WASI that extends the capabilities of Wasm towards the Cloud.

How to make libraries compatible with native AOT

How to make .NET libraries compatible with native AOT

Building resilient cloud services with .NET 8

How to integrate resilience and into HTTP Client

Announcing ML.NET 3.0

Announcing ML.NET 3.0, with improvements for deep learning, DataFrame, performance, and more!

Fake It Til You Make It…To Production

Explores the new logging, metric, and time provider fakes introduced in .NET 8

Announcing .NET Chiseled Containers

.NET chiseled Ubuntu container images are now GA and can be used in production, for .NET 6, 7, and 8.

Improvements & Changes in Android resource generation in .NET 8

In .NET 8 we have made some vast improvements in changes to how Android resources work in regards to the designer assembly. If you are building Android apps and libraries there are some important changes to know about.

Announcing .NET 8

Today Microsoft announced the availability of .NET 8, the latest version of one of the world’s leading programming languages and development platforms.

Introducing .NET Aspire: Simplifying Cloud-Native Development with .NET 8

Introducing .NET Aspire: A cloud ready stack for building observable, production ready, distributed applications

.NET Framework November 2023 Security and Quality Rollup

November 2023 Security and Quality Rollup Updates for .NET Framework

.NET 8 Performance Improvements in .NET MAUI

What improvements did we bring to .NET MAUI in .NET 8? Click to find out more!

ASP.NET Core updates in .NET 8 Release Candidate 2

.NET 8 Release Candidate 2 is now available! Check out what's new in ASP.NET Core in this update.

Announcing .NET MAUI in .NET 8 Release Candidate 2: More Quality

.NET MAUI in .NET 8 RC2 has still more quality improvements for developers, and we have some bonus news.

The convenience of System.Text.Json

JSON is one of the most common formats in apps today and .NET has great APIs for reading and writing JSON documents. It's a great example of the convenience of .NET.

C# Dev Kit – Now Generally Available

We are thrilled to announce the general availability of C# Dev Kit, a Visual Studio Code extension that brings an improved editor-first C# development experience to Linux, macOS, and Windows.

Arm64 Performance Improvements in .NET 8

.NET 8 added some key features for new functionality as well as performance improvements for developers including developers targeting Arm64 devices. In this blog I break down everything you need to know about the improvements in .NET 8.

The .NET Conf Student Zone is Back!

Get ready for the .NET Conf Student Zone on November 13!

.NET Framework September 2023 Cumulative Update Preview

September 2023 Cumulative Update Preview for .NET Framework.

Debugging Enhancements in .NET 8

.NET 8 introduces debugging enhancements to many commonly used types. Check out what is new and discover how .NET debugging is better than ever.

The convenience of .NET

The .NET platform provides convenient solutions to many tasks, for developers looking for a straightforward utility function or a high degree of control crafting an algorithm.

Tune into the C# Certification Training Series

We are hosting six office hour training streams for the new C# Certification training content.

Simplifying F# computations with the new ‘while!’ keyword

F# introduces `while!` keyword, streamlining loops in computation expressions.

What’s new in System.Text.Json in .NET 8

An overview of all new .NET 8 features in System.Text.Json for developers.

.NET Conf 2023 – Celebrating the Release of .NET 8! – Save the Date!

Announcing .NET Conf 2023 - a free, three-day virtual developer event that celebrates the release of .NET 8.

New syntax for string interpolation in F#

New language feature is available in preview for F# to make working with interpolated strings even easier.

.NET Framework July 2023 Cumulative Update Preview

July 2023 Cumulative Update Preview Updates for .NET Framework

Debugging .NET Containers with Visual Studio Code Docker Tools

Use the Docker extension for Visual Studio Code to build and run containerized .NET applications easily

What does Azure AD renamed Microsoft Entra ID mean for .NET developers?

Azure Active Directory (Azure AD) is being renamed as part of unification with the expanded Microsoft Entra identity and network access product family. This is a name change only and does not require any direct action from .NET developers.

.NET Framework July 2023 Security and Quality Rollup Updates

July 2023 Security and Quality Rollup Updates for .NET Framework

.NET July 2023 Updates – .NET 7.0.9, .NET 6.0.20

Check out latest July 2023 updates for .NET 7.0 and .NET 6.0

New C# 12 preview features

.NET 8 Preview 6 adds three new features for C# 12: interceptors, inline arrays, and enhancements to the nameof expression.

ASP.NET Core updates in .NET 8 Preview 6

.NET 8 Preview 6 is now available! Check out what's new in ASP.NET Core in this update.

Announcing .NET MAUI in .NET 8 Preview 6: Hello VS Code & VS for Mac

.NET MAUI in .NET 8 Preview 6 has more new quality improvements for developers, experimental new AOT for iOS, and exciting new Visual Studio support.

Announcing .NET 8 Preview 6

We're thrilled to announce .NET 8 Preview 6 which is packed with plenty of library updates, a new WASM mode, more source generators, constant performance improvements, and NativeAOT support on iOS.

Introducing System.Web Adapters v1.2 with new APIs and scenarios

Introducing the release of System.Web adapters v1.2 which introduces new APIs, better Blazor support, A/B testing of migrated endpoints, and more.

Improved Source Generators and Code Fixers Arrive in .NET Community Toolkit 8.2.1!

Announcing the .NET Community Toolkit 8.2.1, featuring lots of QoL improvements, performance optimizations to the MVVM Toolkit source generators, new code fixers and improved diagnostics, and more!

Improvements to the Caching Abstraction in ASP.NET Core

We are updating caching in ASP.NET Core to be more intuitive and reliable

.NET Framework June 2023 Security and Quality Rollup

June 2023 Security and Quality Rollup Updates for .NET Framework

Announcing .NET MAUI in .NET 8 Preview 5

.NET MAUI makes its way to .NET 8 Preview 5 and is full of new quality improvements for developers across the entire framework. In addition, we are introducing NuGet packages even greater flexibility going forward.

ASP.NET Core updates in .NET 8 Preview 5

.NET 8 Preview 5 is now available! Check out what's new in ASP.NET Core in this update.

Announcing .NET 8 Preview 5

We're thrilled to announce .NET 8 Preview 5, featuring enhanced Metrics APIs, SourceLink integration, default Dynamic PGO, and Alpine ASP.NET Docker Composite Images.

.NET June 2023 Updates – .NET 7.0.7, .NET 6.0.18

Check out June 2023 updates for .NET 7.0 and .NET 6.0

The Microsoft Teams Global Hack – Week 1 Recap and What’s Coming

Last week we launched HackTogether the Microsoft Teams Global Hack – a virtual hackathon all about building apps for Microsoft Teams. Here’s what happened last week and what’s still to come.

HackTogether: the Microsoft Teams Global Hack – Keynote Recap and What’s Coming

Last week we launched HackTogether the Microsoft Teams Global Hack – a virtual hackathon all about building apps for Microsoft Teams. Here’s what happened last week and what’s still to come.

Announcing an update for .NET Upgrade Assistant with a new CLI tool!

The new version of .NET Upgrade Assistant CLI tool is available with all the new features for upgrading your apps!

Speech Recognition in .NET MAUI with CommunityToolkit

Learn how you can incorporate Speech Recognition into your .Net MAUI applications

.NET Framework May 2023 Cumulative Update Preview Updates

May 2023 Cumulative Update Preview Updates for .NET Framework

Get Started with OpenAI Completions with .NET

Learn what completions are and how to use the Azure .NET SDK to generate them using OpenAI.

Drawing Elements on Maps with .NET MAUI

.NET MAUI now features a Map control that allows you not only to display a position with pins, but also render full geometry to essentially draw on a map! In this post I show you how to do it.

Get started with OpenAI in .NET

Learn how to get started using OpenAI models like GPT with .NET and the Azure SDK

Update to the .NET language strategy

Interested in what is going on and the future of .NET languages, (C#, F#, and Visual Basic)? We have just published an updated version of the .NET Language Strategy on our documentation!

Play Audio and Video in .NET MAUI apps with the new MediaElement

.NET MAUI Community Toolkit MediaElement v1.0 is now available! Check out how to get started with playing audio and (live) video in your .NET MAUI app.

Using Command Binding in Windows Forms apps to go Cross-Platform

The WinForms code-behind approach has always made app development in WinForms unrivaled fast. For complex line-of-business apps, however, it can become an architectural challenge. New Command- and Data Binding Features in .NET 7 make UI-Controllers and MVVM an alternative and allow them also be reused in UI stacks like .NET MAUI.

5 .NET MAUI Features for Building Great Desktop Apps

When developing desktop apps with .NET MAUI there are great built in features that you can integrate into your apps to deliver a higher quality experience for the form factor. Today, we take a look at 5 unique features to consider in your apps.

.NET Framework January 2023 Cumulative Update Preview

January 2023 Cumulative Update Preview Updates for .NET Framework.

Announcing .NET Community Toolkit 8.1! Better, faster MVVM source generators, .NET 7 support, and more!

Announcing the official release of the .NET Community Toolkit 8.1, with better, faster MVVM source generators, .NET 7 support, and more!

Announcing ML.NET 2.0

Learn more about what's new in ML.NET 2.0 and Model Builder.

.NET 7 is Available Today

.NET 7 is a major release that provides better performance and new features for C#, .NET MAUI, Web APIs, cloud native, and more. Free Download.

Announcing ASP.NET Core in .NET 7

.NET 7 is now available! Check out all the new features and improvements in ASP.NET Core in .NET 7.

Announcing .NET MAUI for .NET 7 General Availability

.NET MAUI is now available for .NET 7 and is packed with exciting improvements for multi-platform developers including performance improvements, improved tooling, enhanced desktop support, and more!

What’s new in Orleans 7.0

What's new in Orleans 7.0

Welcome to C# 11

C# 11 is here! Bringing with it some highly anticipated features including string literals, generic math, required members, and much more.

Announcing F# 7

F# 7 is here, see what's new!

Entity Framework Core 7 (EF7) is available today

Announcing EF Core 7 (EF7) with JSON column mapping, bulk updates, TPC, and more!

What’s new in Windows Forms in .NET 7.0

Read about the new features that are in Windows Forms in .NET 7 including new accessibility features, High DPI, UI Automation, and more.

What’s new for WPF in .NET 7

Find out what's new in WPF on .NET 7 including accessibility improvements, a focus on performance, and much more.

Announcing the .NET MAUI Community Toolkit v1.3

.NET MAUI Community Toolkit v1.3 is now available! Check out what's new in this update.

.NET Framework September 2022 Cumulative Update Preview

September 2022 Cumulative Update Preview Updates for .NET Framework

.NET MAUI in .NET 7 Release Candidate 1

.NET MAUI is now part of .NET 7 in RC1 with tons of improvements, and a few new features.

ASP.NET Core updates in .NET 7 Release Candidate 1

.NET 7 Release Candidate 1 is now available! Check out what's new in ASP.NET Core in this update.

.NET Conf Focus on MAUI – That’s a wrap!

August 9th we hosted our .NET Conf Focus on MAUI event to announce and share the latest tools and updates for .NET MAUI. With 25 sessions hosted and recorded, we recap the event and get you connected with all of the content from our event.

.NET 6 is now in Ubuntu 22.04

.NET 6 is now included in Ubuntu 22.04 (Jammy) and can be installed with just `apt install dotnet6`.

.NET Framework August 2022 Security and Quality Rollup Updates

August 2022 Security and Quality Rollup Updates for .NET Framework

Announcing .NET Framework 4.8.1

Announcing the release of .NET Framework 4.8.1 that bring ARM64 support, WinForms accessibility enhancements, and more.

Productivity comes to .NET MAUI in Visual Studio 2022

Visual Studio 2022 17.3 is now available and delivers spectacular productivity features for .NET Multi-platform App UI (.NET MAUI).

Announcing .NET 7 Preview 7

.NET 7 Preview 7 is now available with improvements to System.LINQ, Unix file permissions, low-level structs, p/Invoke source generation, code generation, and websockets.

ASP.NET Core updates in .NET 7 Preview 7

.NET 7 Preview 7 is now available! Check out what's new in ASP.NET Core in this update.

Announcing Entity Framework 7 Preview 7: Interceptors!

Announcing EF7 Preview 7 with new and improved interceptors, and so much more!

.NET August 2022 Updates – .NET 6.0.8 and .NET Core 3.1.28

Check out July updates for .NET 6.0 and .NET Core 3.1

Announcing SynapseML for .NET – Large Scale ML with a Simple API

Announcing the release of hundreds of new distributed machine learning models and capabilities for .NET as part of the SynapseML distributed ML library.

Announcing .NET Community Toolkit 8.0! MVVM, Diagnostics, Performance, and more!

We're happy to announce the official launch of the new .NET Community Toolkit version 8.0! Including tons of new features such as MVVM source generators, diagnostics, performance helpers, and more!

Customizing Controls in .NET MAUI

Let's look at how to customize .NET MAUI controls.

Announcing Rate Limiting for .NET

Announcing built-in Rate Limiting support in .NET 7. Rate limiting provides a way to protect a resource to avoid overwhelming your app.

ASP.NET Core updates in .NET 7 Preview 6

.NET 7 Preview 6 is now available! Check out what's new in ASP.NET Core in this update.

.NET Core 3.1 will reach End of Support on December 13, 2022

.NET Core 3.1 will reach end of support on December 13, 2022, this blog breaks down all the valuable information you need to know and how to update to .NET 6.0.

CoreWCF 1.1.0 and project templates

The CoreWCF project, a WCF implementation for .NET Core, has released a 1.1 update. Project templates are now available for creating projects from Visual Studio or the command line.

Getting Started with DevOps and .NET MAUI

Want to add DevOps to your .NET MAUI project? This post shows how to implement a starter pipeline using GitHub Actions and Azure DevOps.

.NET 7 Preview 5 – Generic Math

.NET 7 Preview 5 includes significant improvements to the Generic Math feature.

Exchange Online Journey to .NET Core

Explore Exchange's migration from .NET Framework to .NET Core

Performance Improvements in .NET MAUI

Want to know why .NET MAUI apps boot faster, run smoother, and are smaller? This post break down how we made .NET MAUI fast!

Incremental ASP.NET to ASP.NET Core Migration

Introducing a simple pattern to apply the Strangler Fig pattern to migrating ASP.NET to ASP.NET Core applications with the help of some new adapters.

The Azure Cosmos DB Journey to .NET 6

Azure Cosmos DB is a fully-managed, multi-tenant, distributed, shared-nothing, horizontally scalable database that provides planet-scale NoSQL capabilities offering APIs for Apache Cassandra, MongoDB, Gremlin, Tables, and the Core (SQL) APIs . A core component of the Azure Cosmos DB service is the API Gateway that handles request parsing and routing across all supported APIs.

Regular Expression Improvements in .NET 7

System.Text.RegularExpressions has improved significantly in .NET 7. In this post, we'll deep-dive into many of its exciting improvements.

.NET May 2022 Updates – .NET 6.0.5, .NET 5.0.17 and, .NET Core 3.1.25

Check out May updates for .NET 6.0, .NET 5.0, and .NET Core 3.1

.NET Framework May 2022 Security and Quality Rollup

We are releasing the May 2022 Security and Quality Rollup Updates for .NET Framework.

Upgrading a WCF service to .NET 6 with CoreWCF

Let's take a look at how to upgrade a sample WCF service from .NET Framework to .NET 6 using CoreWCF!

YARP 1.1 is here with new requested reverse proxy features

YARP 1.1 has been released. YARP is a highly customizable open-source reverse proxy written for .NET. This release adds a few commonly requested features.

Announcing .NET 7 Preview 3

.NET 7 Preview 3 is now available with enhancements to observability, startup times, codegen, GC regions, native AOT compilation, and more.

.NET MAUI Release Candidate – Ready for cross-platform app development

.NET MAUI Release Candidate is now feature complete, API stable for the upcoming GA release. Get started today to build app for Android, Windows, iOS, and macOS.

.NET Automatic Updates for Server Operating Systems

Server operating systems can opt in to get automatic updates for .NET. Learn how to easly opt in so you never miss an update.

.NET Framework 4.5.2, 4.6, and 4.6.1 will reach End of Support on Apr 26, 2022

.NET Framework 4.5.2, 4.6, and 4.6.1 will reach End of Support on Apr 26, 2022, this blog post is a reminder/refresher for customers that might have missed the post a year ago.

.NET 5.0 will reach End of Support on May 08, 2022

.NET 5.0 will reach end of support on May 08, 2022, this blog breaks down all the valuable information you need to know and how to update to .NET 6.0.

Announcing .NET MAUI Preview 14

.NET MAUI Preview 14 has shipped with plenty of great new features to try out including a hefty volume of issue resolutions and features, including the MenuBar!

Automate code metrics and class diagrams with GitHub Actions

Let's take a look at how you can add code metrics and diagrams for your open-source .NET repositories with GitHub Actions.

.NET March 2022 Updates – .NET 6.0.3, .NET 5.0.15 and, .NET 3.1.23

Today, we are releasing the .NET March 2022 Updates. These updates contain reliability and security improvements. See the individual release notes for details on updated packages. You can download 6.0.3, 5.0.15 and, 3.1.23 versions for Windows, macOS, and Linux, for x86,

Sharing code between ASP.NET and ASP.NET Core

With the release of .NET 6 there are even more benefits to using ASP.NET Core. But migrating existing code to ASP.NET Core often sounds like a big investment. Today we’ll share how you can accelerate the migration to ASP.NET Core. There are minor changes you can make today that can make it easier to migrate to ASP.NET Core tomorrow.

Training a ML.NET Model with Azure ML

Learn how to create a training pipeline for ML.NET using Azure ML and Azure Devops.

.NET 💜 GitHub Actions

Hi friends, I put together two posts where I’m going to teach you the basics of the GitHub Actions platform. In this first post, you’ll learn how GitHub Actions can improve your .NET development experience and team productivity. I’ll show you how to use them to automate common .NET app dev scenarios with workflow composition.

Early peek at C# 11 features

Learn about the C# 11 preview features you can try out in Visual Studio 17.1 and the .NET SDK version 6.0.200.

Announcing Entity Framework 7 Preview 1

EF7 will focus on JSON column support, bulk updates, performance, and enabling EF6 upgrades plus much more. Preview 1 lays the foundation.

Announcing .NET 7 Preview 1

Announcing .NET 7 Preview 1, the first preview of a major .NET version that will focus on app modernization, cloud native, containers and more.

.NET Framework February 2022 Cumulative Update Preview

Today, we are releasing the February 2022 Cumulative Update Preview for .NET Framework. Security The February Security and Quality Rollup Update does not contain any new security fixes. See January 2022 Security and Quality Rollup for the latest security updates. Quality and Reliability This release contains the following quality and reliability improvements.

Happy 20th Anniversary, .NET!

Today marks 20 years since Visual Studio .NET launched and the first version of the .NET platform was released. We’re celebrating all month long!

.NET Framework February 2022 Security and Quality Rollup

This week, we released the February 2022 Security and Quality Rollup for .NET Framework. Security The February Security and Quality Rollup Update does not contain any new security improvements. See January 2022 Security and Quality Rollup for the latest security updates.

.NET February 2022 Updates – 6.0.2 and 5.0.14

Check out February 2022 updates for .NET 6.0 and .NET 5.0.

Databinding with the OOP Windows Forms Designer

The design-time support for databinding in the new Windows Forms (WinForms) .NET Out of Process (OOP) Designer is different from the Framework Designer. The WinForms OOP Designer has a new and easier approach for hooking up data sources, focusing on Object Data Sources to support .NET based object relational mapper technologies (like the latest version of Entity Framework Core – EF Core for short) which the WinForms team recommends as a successor for Typed DataSets.

Performance improvements in ASP.NET Core 6

Performance improvements in ASP.NET Core 6.0!

.NET Framework January 2022 Cumulative Update Preview

Today, we are releasing the January 2022 Cumulative Update Preview for .NET Framework. Quality and Reliability This release contains the following quality and reliability improvements. CLR1 Addresses rare crashes and hangs that can appear in cases where a GC occurs while another thread is in the middle of certain special paths used to invoke shared-generic code from non-shared-generic contexts.

State of the Windows Forms Designer for .NET Applications

The Windows Forms designer for .NET applications is here, the blog post will give you insights into the new architecture and changes been made

.NET Framework January 2022 Security and Quality Rollup Updates

Yesterday, we are released the January 2022 Security and Quality Rollup Updates for .NET Framework. Security CVE-2022-21911 – .NET Framework Denial of Service This security update addresses an issue where an unauthenticated attacker could cause a denial of service on an affected system.

Announcing .NET MAUI Preview 11

.NET MAUI Preview 11 continues to stabilize controls and layouts, and introduces multi-window and Fluent updates for Windows.

A Comprehensive Guide to Port from EF6 to EF Core

Get detailed, step-by-step guidance for porting your Entity Framework EF6 apps to EF Core whether you use code-first or database-first.

Announcing the Plan for EF7

What's in store for the next version of Entity Framework Core? Find out in this post that announces the official EF7 roadmap.

.NET December 2021 Updates – 6.0.1, 5.0.13 and 3.1.22

Check out December 2021 updates for .NET 6.0, .NET 5.0, and .NET Core 3.1.22 which contain reliability and security improvements.

Announcing dot.net in Japanese and Simplified Chinese

The .NET website is now available in Japanese and Simplified Chinese allowing us to reach that global community.

What’s new for gRPC in .NET 6

Check out the great new features and performance improvements for gRPC in .NET 6!

.NET Conf 2021 Recap – Videos, Slides, Demos, and More

.NET Conf 2021 is over, but you can re-live the largest .NET event of the year with full access to video recordings, slides, demos, and more.

Get to Know EF Core 6

EF Core 6: improved support for Azure Cosmos DB, increased performance, first-class APIs, SQL Server temporal tables and more!

Infer# v1.2: Interprocedural Memory Safety Analysis For C#

Infer# v1.2 brings the first interprocedural race condition detection to .NET, use it today locally in Windows.

What’s new in Windows Forms in .NET 6.0

Read about the new features that are in Windows Forms in .NET 6.0.

Azure Active Directory’s gateway is on .NET 6.0!

Read about gains from Azure Active Directory gateway service's migration from .NET 5.0 to .NET 6.0.

.NET Framework November 2021 Cumulative Update

Today, we are releasing the November 2021 Cumulative Update for .NET Framework. Security The November Security and Quality Rollup Update does not contain any new security fixes. See February 2021 Security and Quality Rollup for the latest security updates. Quality and Reliability This release contains the following quality and reliability improvements.

F# 6 is officially here!

F# 6 is released as part of .NET 6. You'll find new task based async, pipeline debugging, and tons of other features.

What’s New for Visual Basic in Visual Studio 2022

Check out the great new features for Visual Basic developers in Visual 2022

Welcome to C# 10

Check out the great new features in C# 10 as part of .NET 6 and Visual Studio 2022, that make your code prettier, more expressive, and faster.

Introducing the .NET Tech Community Forums

Today, we are launching the .NET Tech Community for developers to have deep technical discussions, share how-tos, talk best practices, and more.

.NET 6 Launches at .NET Conf, November 9-11

.NET Conf is a free, three-day, virtual developer event that celebrates the major releases of the .NET development platform. This year .NET 6 launches at .NET Conf 2021. Come celebrate and learn about the new release.

Women IC engineer mentoring ring

During this fiscal year I ran a women IC mentoring ring in the Developer Division at Microsoft. It was part of the women's mentoring ring program in our division. I've always felt a little sad when I looked around and saw very few women ICs at very senior levels.

Update on .NET Hot Reload progress and Visual Studio 2022 Highlights

Updating progress and all the wonderful features towards .NET Hot Reload and Visual Studio 2022 Highlights.

What’s new in F# 6

F# 6 is now a release candidate. Checkout all of the new features available in this release.

Contributing to .NET MAUI Community Toolkit

Announcing the new process for contributing to the .NET MAUI Community Toolkit.

.NET October 2021 Updates – 5.0.11 and 3.1.20

Releasing .NET 5 and .NET Core Updates for October 2021 which contains reliability and other improvements.

ASP.NET Core updates in .NET 6 Release Candidate 2

.NET 6 Release Candidate 2 (RC2) is now available. .NET 6 RC2 is very close to the final build of .NET 6 that we expect to ship in November this year in time for .NET Conf 2021. It’s also a “go live”

Prime your flux capacitor: SQL Server temporal tables in EF Core 6.0

Restore deleted records, use LINQ to query audit history and more with EF Core's new temporal table support.

ML.NET Updates & Announcing Notebooks in Visual Studio

Check out what's new in ML.NET and Model Builder

HTTP/3 support in .NET 6

.NET 6 includes preview support for HTTP/3: In Kestrel, HTTP.Sys & IIS for ASP.NET for server scenarios In HttpClient to make outbound requests For gRPC What is HTTP/3 and why is support important? HTTP through version 1.1 was a relatively simple protocol,

Announcing .NET 6 Release Candidate 1

.NET 6 Preview Release Candidate 1 is now available.

Update on .NET Multi-platform App UI (.NET MAUI)

Update on .NET Multi-platform App UI (.NET MAUI)

File IO improvements in .NET 6

Learn about high-performance file IO features in NET 6, like concurrent reads and writes, scatter/gather IO and many more.

Learn to build applications with F#

Want to learn how to write write succinct, robust, and performant code with F#? Here's everything you need to get started today!

Understanding the cost of C# delegates

Delegates are widely used in C# (and .NET, in general). In this post, Paulo will show the various forms to make you aware of their costs.

.NET Core 2.1 container images will be deleted from Docker Hub

NET Core 2.1 Docker container images will no longer be available on Docker Hub, but exclusively on Microsoft Container Registry (MCR).

Introducing DevOps-friendly EF Core Migration Bundles

EF Core's new migration bundles provide build artifacts to deploy schema and data changes to your database as part of your DevOps pipeline.

Announcing .NET MAUI Preview 7

.NET MAUI (Multi-platform App UI) Preview 7 is now available with new layouts, improved accessibility, font scaling, and more.

.NET Framework July 2021 Cumulative Update Preview

July 2021 Cumulative Update Preview for .NET Framework to address quality and reliability improvements in CLR and Windows Forms.

Conversation about the .NET open source project

Conversation with .NET engineers about the .NET open source project, five+ years in.

Try the new System.Text.Json source generator

Learn about the new System.Text.Json source generator

Conversation about skills and learning

Conversation with .NET engineers about dev skills and learning. They share their perspectives on the skills and aptitudes needed to be successful on the team.

.NET Framework June 2021 Cumulative Update Preview

Earlier this week, we released the June 2021 Cumulative Update Preview for .NET Framework for Windows 10, version 2004, Windows Server 2004, Windows 10, version 20H2, Windows Server 20H2, and Windows 10, version 21H1. Quality and Reliability This release contains the following quality and reliability improvements.

What’s new in Windows Forms in .NET 6.0 Preview 5

Read about the new features that are in Windows Forms in .NET 6.0 Preview 5.

Package Validation

Get started with Package Validation tooling which will be available with .NET 6.

ML.NET June Updates

Check out what's new in ML.NET and Model Builder.

Announcing .NET MAUI Preview 5

.NET Multi-platform App UI (.NET MAUI) Preview 5 is now available.

Conversation about networking

Conversation with .NET engineers about networking in .NET. T

Migration of Bing’s Workflow Engine to .NET 5

Bing runs one of the world’s largest, most complex, highly performant, and reliable .NET applications. This posts discusses the journey and the work required to upgrade to .NET 5.

Show dotnet: Running my .NET nanoFramework for 8 years on a battery

Today, I’d like to show dotnet how to run your own .NET application on a Micro Controller Unit (MCU) on a simple battery for multiple years. I’ll build an application that will read the temperature and pressure on a BMP280 sensor connected to an ESP32.

Conversation about containers

Conversation with .NET engineers who make .NET work great with containers.

Conversation about the .NET type system

Conversation with .NET engineers about the .NET type system.

Announcing Visual Studio Code extension for Tye

We are excited to announce the availability of our Visual Studio Code Tye extension, which makes it easier to view, run, and debug applications that are using Tye from within Visual Studio Code. This is a continuation of the Tye experiment,

F# and F# tools update for Visual Studio 16.10

Announcing updates to the F# tools for Visual Studio 16.10

.NET Framework May 2021 Cumulative Update Preview for Windows 10, versions 2004, 20H2, 21H1

Today, we are releasing the May 2021 Cumulative Update Preview for .NET Framework. Quality and Reliability This release contains the following quality and reliability improvements. CLR1 Addresses a performance issue caused by incorrect configuration in the GC. Addresses an issue where a background GC could pause the runtime for a long period of time if a large managed heap is filled with long lived objects with a deep chain of references.

Announcing Entity Framework Core 6.0 Preview 4: Performance Edition

EF Core 6.0 Preview 4 is here and has the best performance ever. Read this post to learn how the team boosted speed by 70% over EF Core 5.0!

Introducing the .NET Hot Reload experience for editing code at runtime

Introducing the new .NET Hot Reload user experience for editing managed code at runtime, now available through the Visual Studio 2019 debugger and dotnet watch.

Show dotnet: Investigating Alpine Linux CVEs in .NET container images

CVE management is an increasingly important topic. I wrote earlier this year about CVE management in Staying safe with .NET containers, to provide more insight and guidance on this topic. In this post, I walk through a CVE investigation I did earlier this week for a customer and new guidance that I shared with them.

.NET Framework May 2021 Cumulative Update Preview

Today, we are releasing the May 2021 Cumulative Update Preview for .NET Framework. Quality and Reliability This release contains the following quality and reliability improvements. CLR1 Addresses a performance issue caused by incorrect configuration in the GC. Addresses an issue where a background GC could pause the runtime for a long period of time if a large managed heap is filled with long lived objects with a deep chain of references.

Conversation about ready to run

Ready to run (R2R) is the native executable code format for .NET. R2R code is produced using the crossgen tool. We’re using the conversation format again, this time with three of the engineers who work on ready to run code generation.

Conversation about PGO

Profile guided optimization (PGO) is an exciting area of investment in .NET 6 release. We’re working on both static and dynamic variations of PGO, with the intention of using them together and offering the best of what they both have to offer.

.NET Framework May 2021 Security and Quality Rollup Updates

Yesterday, we released the May 2021 Security and Quality Rollup Updates for .NET Framework. Quality and Reliability This release contains the following quality and reliability improvements. CLR1 Addresses an issue where the entire process would be torn down when a NullReferenceException propagated out of an exception filter.

.NET May 2021 Updates – 5.0.6, 3.1.15, 2.1.28

Today, we are releasing the .NET May 2021 Updates. These updates contains reliability and security improvements. See the individual release notes for details on updated packages. You can download 5.0.6 , 3.1.15, 2.1.28 versions for Windows, macOS, and Linux, for x86,

Put a DPAD on that GC!

Say what? Yes, there's a new feature called DPAD for regions – regions is what we are currently working on in .NET 6 to convert segments to. In this blog post I will first give some introduction to regions then talk about the DPAD feature.

.NET Framework 4.5.2, 4.6, 4.6.1 will reach End of Support on April 26, 2022

.NET Framework 4.5.2, 4.6, 4.6.1 will reach End of Support on April 26, 2022. Update your deployed framework runtime to a supported version.

Conversation about crossgen2

Crossgen2 is an exciting new platform addition and part of the .NET 6 release. It is a new tool that enables both generating and optimizing code in a new way. The crossgen2 project is a significant effort, and is the focus of multiple engineers.

What’s new in dotnet monitor

Learn about what's new in dotnet monitor which includes egress providers, custom metric, and security and hardening.

Loop alignment in .NET 6

Learn some great ideas on how to implement loop alignment in .NET 6 and get maximum benefit without affecting the performance adversely.

Show dotnet: Build your own unit test platform? The true story of .NET nanoFramework.

.NET nanoFramework works directly on microprocessors like ESP32, STM32. It needed a proper unit testing platform. I'll explain you how it's been built.

.NET April 2021 Updates – .NET Core 3.1.14 and .NET Core 2.1.27

Today, we are releasing .NET Core 3.1.14 and .NET Core 2.1.27 April updates. These updates contains reliability and other non-security improvements. See our April blog post for details on all April servicing releases.

Show dotnet: Animating 40 LEDs with charlieplexing

For Pi day 2021, I published a fun post on how to Blink LEDs with Raspberry Pi. As part of that writeup, I wanted to include a 40 LED charlieplexing example, but couldn’t get it working. It is working now, and I decided to do a follow-up post to show it to you.

Announcing .NET 6 Preview 3

Releasing .NET 6 Preview 3 which is dedicated to entirely low-level performance features.

.NET April 2021 Updates – 5.0.5

Today, we are releasing the .NET April 2021 Updates. These updates contains reliability and other non-security improvements. See the individual release notes for details on updated packages. You can download 5.0.5 versions for Windows, macOS, and Linux, for x86, x64, Arm32,

Announcing Open Source C# standardization

The C# standards committee moved its work into Open Source, enabling C# developers worldwide to participate in the standardization effort.

Loop alignment in .NET 6

When writing a software, developers try their best to maximize the performance they can get from the code they have baked into the product. Often, there are various tools available to the developers to find that last change they can squeeze into their code to make their software run faster.

Cloud-Native learning resources for .NET developers

The .NET team has put together a collection of free resources to help you speed up your cloud-native application development journey.

OpenTelemetry .NET reaches v1.0

Learn a new standard for observability telemetry with OpenTelemetry .NET which was created by merging OpenTracing and OpenCensus.

The path to .NET 5 and Blazor WebAssembly with some fun sprinkled in

Rock, Paper, Scissors, Lizard, Spock was recently upgraded to .NET 5 and uses Blazor WebAssembly. Here is a summary of our experience completing the upgrade.

ML.NET and Model Builder March Updates

New version of ML.NET and Model Builder brings bug fixes, enhancements and new features, including config-based training and a redesigned Consume step.

Announcing Entity Framework Core 6.0 Preview 2

Announcing the release of EF Core 6.0 Preview 2, the second preview of the new Entity Framework Core with new features and bug fixes.

Announcing .NET 6 Preview 2

Releasing .NET 6 Preview 2 which includes new APIs, runtime performance improvements, and early builds of .NET MAUI.

Blinking LEDs with Raspberry Pi

Learn how to use the Raspberry Pi to blink LEDs with C# and .NET GPIO APIs.

.NET March 2021 Updates – 5.0.4, 3.1.13, 2.1.26

Today, we are releasing the .NET March 2021 Updates. These updates contains reliability and security improvements. See the individual release notes for details on updated packages. You can download 5.0.4 , 3.1.13, 2.1.26 versions for Windows, macOS, and Linux, for x86,

.NET Core 2.1 will reach End of Support on August 21, 2021

Update your apps to a supported version of .NET Core as .NET Core 2.1 will be reaching end of support on August 21, 2021.

.NET Interactive with SQL!| .NET Notebooks in Visual Studio Code

.NET Interactive now ships with SQL support. Learn about how you can start using SQL and Entity Framework Core in your .NET Notebooks today.

F# and F# tools update for Visual Studio 16.9

Announcing updates to the F# tools for Visual Studio 16.9 which includes .NET 5 scripting, productivity features, tooling performance and more.

Introducing the .NET Upgrade Assistant Preview

Introducing .NET Upgrade Assistant to help you move your .NET Framework-based applications to .NET 5 at your own pace with confidence.

Serve ML.NET Models as HTTP APIs with minimal configuration

Learn how to serve machine learning ML.NET models from HTTP APIs using minimal configuration.

Internals of the POH

As folks are aware we added a new kind of heap in .NET 5 called the POH (Pinned Object Heap). Since this is a user facing feature (and there aren't that many of those in GC) I've been meaning to write about it but didn't get around till now.

.NET Framework February 2021 Cumulative Update Preview for Windows 10 2004, Windows Server, version 2004, Windows 10, version 20H2 and Windows Server, version 20H2

Today, we are releasing the February 2021 Cumulative Update Preview for .NET Framework for Windows 10 2004, Windows Server, version 2004, Windows 10, version 20H2 and Windows Server, version 20H2. Quality and Reliability This release contains the following quality and reliability improvements.

Survey: Library & Open Source

Take the survey and help us to identify pain points and concerns so we can make your experience better!

Announcing Entity Framework Core 6.0 Preview 1

Announcing the release of EF Core 6.0 Preview 1, the first preview of the new Entity Framework Core with loads of new features.

Announcing .NET 6 Preview 1

.NET 6 Preview 1 is now available and is the start of the next major .NET release, focused on .NET unification and supporting new platforms.

.NET Framework February 2021 Cumulative Update Preview for .NET Framework.

Yesterday, we released the February 2021 Cumulative Update Preview for .NET Framework. Quality and Reliability This release contains the following quality and reliability improvements. CLR1 Addresses an issue where the entire process would be torn down when a NullReferenceException propagated out of an exception filter.

Staying safe with .NET containers

An update on using .NET and containers together, learn how to tackle staying safe and keeping your container images up-to-date.

.NET Framework February Security and Quality Rollup

Today, we are releasing the February 2021 Security and Quality Rollup Updates for .NET Framework. Security CVE-2021-24111– .NET Framework Denial of Service Vulnerability This security update addresses a denial of service vulnerability in .NET Framework. For more information please see CVE-2021-24111.

.NET February 2021 Updates – 5.0.3, 3.1.12, 2.1.25

Today, we are releasing the .NET February 2021 Updates. These updates contains reliability and security improvements. See the individual release notes for details on updated packages. You can download 5.0.3 , 3.1.12, 2.1.25 versions for Windows, macOS, and Linux, for x86,

Using C# Source Generators to create an external DSL

The blog post looks at how to use C# Source Generators to build an external DSL to represent mathematical expressions.

The Plan for Entity Framework Core 6.0

This blog post details the plan for the next version of Entity Framework Core, EF Core 6.0. EF6 parity, performance improvements and more!

Azure Active Directory’s gateway is on .NET Core 3.1!

Learn about Azure Active Directory gateway service's move from .NET Framework to .NET Core and resulting in doubling the throughput.

Diagnostics improvements in .NET 5

Introducing the new wave of Diagnostics improvements in .NET 5 as we provide a single-file distribution mechanism available on the target machine.

.NET 5 Networking Improvements

Introducing networking features which includes improvements around HTTP, Sockets, networking-related security, and other primitives.

WSFederationHttpBinding in .NET Standard

Implement scenarios that consume WCF services with WS-Federation bindings on .NET Core with the release of System.ServiceModel.Federation.

What’s next for System.Text.Json?

Learn about the new performance, reliaility and easy adoption that has been made with System.Text.Json, and what’s going to come next.

Localize .NET applications with machine-translation

Introducing a GitHub Action that creates machine-translations for .NET localization allowing you to build, test, and deploy your code.