.NET 11 Preview 1 is now available

Today, we are excited to announce the first preview release of .NET 11! We just shipped our first preview release, adding to some major enhancements across the .NET Runtime, SDK, libraries, C#, ASP.NET Core, Blazor, .NET MAUI, and more. Check out the full release notes linked below and get started today.

Download .NET 11 Preview 1

This release contains the following improvements.

Libraries​

• Zstandard Compression Support
• BFloat16 Floating-Point Type
• ZipArchiveEntry Improvements
• FrozenDictionary Collection Expression Support
• TimeZone Improvements
• Rune Support Across String, StringBuilder, and TextWriter
• MediaTypeMap for MIME Type Lookups
• HMAC and KMAC Verification APIs
• Hard Link Creation APIs
• DivisionRounding for Integer Division Modes
• Happy Eyeballs Support in Socket.ConnectAsync
• Performance Improvements
• Full Release Notes

Runtime​

• Runtime Async
• CoreCLR on WebAssembly
• Interpreter Expansion
• JIT Performance Improvements
• GC Heap Hard Limit for 32-bit Processes
• RISC-V and s390x Architecture Enablement
• Full Release Notes

SDK​

• dotnet run: Interactive Target Framework and Device Selection
• dotnet test: Positional Arguments
• dotnet watch: Hot Reload Reference Changes and Configurable Ports
• New Code Analyzers
• Full Release Notes

MSBuild​

• Terminal Logger Improvements
• MSBuild Language and Evaluation Fixes
• New APIs and Capabilities
• Performance Improvements
• Full Release Notes

C#​

• Collection Expression Arguments
• Extended Layout Support
• Full Release Notes

F#​

This release you will find updates across the F# compiler, including parallel compilation enabled by default, faster compilation of computation expression-heavy code, new features like --disableLanguageFeature and --typecheck-only for FSI, the ML compatibility removal, and bug fixes.

Visual Basic​

.NET 11 Preview 1 doesn’t include any new Visual Basic language features or breaking changes. Browse the full release notes for details.

ASP.NET Core & Blazor​

• EnvironmentBoundary Component
• Label Component for Forms
• DisplayName Component
• QuickGrid OnRowClick Event
• Relative Navigation with RelativeToCurrentUri
• SignalR ConfigureConnection for Interactive Server Components
• IHostedService Support in Blazor WebAssembly
• OpenAPI Schema Support for Binary File Responses
• IOutputCachePolicyProvider
• Auto-trust Development Certificates in WSL
• Full Release Notes

.NET MAUI​

• XAML Source Generation by Default

.NET for Android​

• CoreCLR by Default
• dotnet run Enhancements

Browse the full release notes for all of this and more.

Windows Forms​

This release focused on quality improvements. A full list of changes can be found in the release notes.

Windows Presentation Foundation (WPF)​

This release focused on quality improvements, including fixes for Fluent window backdrop and background in Windows 10. A full list of changes can be found in the release notes.

Entity Framework Core​

• Complex Types and JSON Columns on Entity Types with TPT/TPC Inheritance
• Create and Apply Migrations in One Step
• Azure Cosmos DB Transactional Batches
• Azure Cosmos DB Bulk Execution
• Azure Cosmos DB Session Token Management
• Full Release Notes

Container Images​

.NET 11 Preview 1 does not introduce new container image features. Browse the full release notes for details.

Get started​

To get started with .NET 11, install the .NET 11 SDK.

If you’re on Windows using Visual Studio, we recommend installing the latest Visual Studio 2026 Insiders. You can also use Visual Studio Code and the C# Dev Kit extension with .NET 11.