.NET 11 RC2: What Is New and Whether to Upgrade From 8 or 10
.NET 11 RC2, published on 13 October 2026, is the final release candidate and ships with a go-live license, but the practical advice is split by where you start: .NET 8 teams must move before 10 November 2026 and should land on .NET 10, while .NET 10 teams have until November 2028 and can wait for .NET 11 GA. [1] .NET 11 is a Standard Term Support release, so it gets two years of patches, from 10…
On 13 October 2026, Microsoft released .NET 11 RC2, the second release candidate and final pre-release before the general availability (GA) version. The RC2 build is production-ready under a go-live license, meaning it can be used in production environments. However, Microsoft has not announced a GA date for .NET 11 yet.
Teams using .NET 8 must upgrade before 10 November 2026 and then move to .NET 10. Those using .NET 10 have until 10 November 2028 before they need to upgrade again. .NET 11, being a Standard Term Support (STS) release, receives two years of patches from its release date of 10 November 2026 until 9 November 2028.
The RC2 release includes several incremental updates and new features, though most are still marked as preview in the documentation. These changes mostly affect libraries and runtime support, with a few notable additions for developers:
1. DataAnnotations can now format messages with attribute-specific arguments.
2. CBOR reading has been made incremental.
3. Experimental ML-KEM and HPKE APIs have been added, but they are labeled as experimental and should not be used for production protocols.
4. Runtime changes include disabling file locking on iOS and tvOS by default.
5. SDK improvements include quoted values in file-level directives and MSBuild property support in launch-profile arguments.
6. MSBuild has faster wildcard matching during project evaluation.
7. NuGet allows setting a minimum package publication age from the CLI.
8. ASP.NET Core's QuickGrid virtualization APIs are no longer experimental.
9. .NET MAUI gains C# UI creation, Apple Icon Composer asset support, XAML authoring, and Hot Reload work, along with platform-specific updates.
10. Windows Forms introduces a KioskModeManager component, deferred form reveal, suspension of painting and layout during bulk updates, and new analyzers.
11. F# gets runtime async support, reraise in computation expressions, lower compiler memory use, and faster FSharp.Core collections.
The C# language features included in C# 15 are also preview, such as collection expression arguments, union types, closed hierarchies, extension indexers, and labeled break and continue statements. These changes are documented on the C# 15 page and can be used with the appropriate language version setting in the compiler.
In summary, .NET 11 RC2 is a significant release that includes important updates for developers across different .NET platforms. Teams should plan their upgrade according to their current version and the release date of the GA build, which is currently unknown.
Written by urgent.news from Dev.to's reporting — not their text. Machine-written — may contain errors; check the original before relying on it.
