You get strong new tools in .NET 10 that change how you code each day.
C# 14 gives you extension members, field-backed properties, and better pattern matching for cleaner code.
The command-line interface now has script mode, faster tab-completion, and better diagnostics.
Minimal APIs and Blazor updates help you build web projects faster and easier.
You will see better performance with improved JIT compilation, smarter memory use, and better file handling.
What’s New in .NET gives you features that help you write code faster and use resources better.
Key Takeaways
C# 14 adds new things like extension members and field-backed properties. These help make your code look neat and simple to use.
The command-line interface has a script mode now. You can run C# scripts right from the terminal. This is good for quick tests and automation.
Minimal APIs and Blazor updates let you build web apps faster. They help you keep things organized and fix errors more easily.
.NET 10 makes apps start up quicker and use less memory. This makes users have a better experience.
Security is better now, with post-quantum cryptography added. This helps keep your apps safe from new threats in the future.
What’s New in .NET 10
C# 14 Features
C# 14 brings changes that help you write cleaner code. You can use extension members to add static members to types. This lets you add new features without changing old code. Field-backed properties use the field keyword. This helps you make properties with hidden fields. You write less code and keep your classes simple. Null-conditional assignments let you assign values only if objects are not null. This makes your code safer.
C# 14 lets you write less repeated code and manage properties easily. It is easier to keep your code neat, even in big projects.
These features help you work better every day. Your code will be easier to read and fix. You will spend less time on repeated tasks and more time solving problems.
CLI and Tooling Updates
.NET 10 has new updates for the command-line interface and tools. You can use script mode with dotnet run file.cs. This lets you run C# scripts from the terminal. You can test ideas or automate tasks without making a full project. The CLI now has faster tab-completion. You can find commands and options quickly. Diagnostics tools are better. You get clearer error messages and more details for debugging.
You can use the Upgrade Assistant CLI tool to move your apps to the newest version. This tool works in Visual Studio and on the command line. It supports many project types and uses AI to make upgrades easier.
The Upgrade Assistant CLI tool helps you upgrade apps to the latest .NET.
It helps you move from older platforms like Azure Functions and WinForms.
You can use it in Visual Studio or on the command line.
These updates help you build, test, and upgrade projects faster. You spend less time setting up and fixing problems. You get more time to write code.
Minimal APIs and Blazor
.NET 10 improves Minimal APIs and Blazor. Minimal APIs now let you group endpoints. This helps you organize routes better. OpenAPI integration is better, so you can make API docs easily. Validation is simpler, with built-in support for error responses.
Blazor is faster and smoother for web development. Required component parameters help you find mistakes before running your app. Blazor WebAssembly moves byte arrays faster. This helps with big data tasks.
Required component parameters in Blazor help you catch mistakes early, so you develop faster.
Faster byte array transfers for JavaScript interop make Blazor WebAssembly work better with big files.
You will build web apps faster and see better performance. These changes help you make modern web apps with less work.
.NET 10 also adds new ways to publish containers and use Ahead-of-Time (AOT) compilation. You can publish single-file apps with smaller images and built-in HTTPS. This makes it easier to deploy cloud apps.
.NET 10 gives you tools to make your workflow smoother, your code cleaner, and your projects easier to handle.
Performance and Runtime
JIT and NativeAOT
.NET 10 makes apps start faster and use less memory. Native AOT now cuts API startup time by 80%. For example, startup goes from 70ms to 14ms. This means your apps are ready for users much quicker. Memory use is also over 50% lower. This helps when your app needs to grow or restart a lot.
Native AOT apps start up faster than regular .NET apps.
Native AOT apps use less memory than before.
Managed apps with JIT get better after starting because of runtime changes.
These updates help you make apps that launch fast and use fewer resources. This is important for cloud apps and busy websites.
Hot Reload
Hot Reload in .NET 10 lets you change code and see results right away. You do not need to restart your app. You can use Hot Reload in mobile, desktop, and web projects. For example:
You can change Xamarin apps while they run, which saves time.
WPF apps show changes in XAML or code behind right away.
Blazor components update as you work, so you test UI changes fast.
You can change unit tests and see results at once.
Teams using ASP.NET Core can work faster and get more done.
Hot Reload helps you work faster and see feedback right away. You spend less time waiting and more time making your app better.
You will see smoother apps, less memory use, and faster response times. These changes help you make apps that work well for more users and bigger data.
Cloud, Diagnostics, and Security
Container Publishing
.NET 10 lets you publish and manage containers in new ways. You can make container images for console apps with the dotnet publish /t:PublishContainer command. You do not need to write a Dockerfile anymore. This makes it much easier to deploy your app. You can pick the image format, like .Docker or .OCI, by setting the <ContainerImageFormat> property. These changes help you deploy cloud-native apps faster and with fewer steps.
.NET 10 has templates and automation tools that are ready to use. These tools cut setup time by 40%. You spend less time on boring code and more time making features.
Observability Tools
.NET 10 gives you better ways to watch your apps. Built-in performance monitoring helps you find problems early. Real-time diagnostics show how your app works and help you fix things fast. Swiggy and Lenovo both saw big improvements. Swiggy made their mean time to recovery (MTTR) 15 minutes shorter. Lenovo fixed problems 85% faster. These tools help your apps run well and let you fix issues quickly.
You can now work on new features instead of just fixing bugs.
Security Enhancements
.NET 10 adds strong security to keep your apps safe. It supports post-quantum cryptography, which protects your data from future threats. Three new quantum-resistant algorithms are now in the core libraries. You get new tools for secure key exchange and digital signatures. Role-based access control and automated scanning help you control who can use your app and keep it safe. These updates make developers 30% happier and help you meet new security rules.
Support for post-quantum cryptography
Quantum-resistant algorithms in core libraries
Tools for secure key exchange and digital signatures
With these features, you can build and launch secure, cloud-ready apps with confidence.
Migration and Compatibility
Upgrade Steps
If you want to move your projects to .NET 10, you need a plan. First, test your apps with .NET 10 previews in Q3 2025. This helps you find problems early. Try to finish moving by the middle of 2026. This keeps you safe from .NET 8 support ending. Treat every warning as an error. This helps you catch old APIs before you upgrade. Many people ignore warnings, and their builds work, but the app breaks later. You should also check your NuGet packages. Some packages might not work with .NET 10 yet.
Tip: Update your dependencies before you start moving. This helps you avoid problems during migration.
Breaking Changes
.NET 10 brings some changes that can break your code. Marshal methods are now turned on by default. If you want to turn them off, set $(AndroidEnableMarshalMethods) to false in your project file. Trimmer warnings show up by default. You can hide these by setting $(SuppressTrimAnalysisWarnings) to true. If you want to skip original resource bundling, set $(BundleOriginalResources) to false in your library project file.
Note: Check your project files for these settings. This helps you avoid surprises after you upgrade.
Legacy Support
You might have old projects that use features from earlier .NET versions. .NET 10 still supports many old APIs. You can run most older code, but you should look for APIs that are no longer used. The Upgrade Assistant tool helps you find and fix old code. You can use it in Visual Studio or on the command line. It scans your projects and gives you ideas for updates. What’s New in .NET also has better checks for compatibility, so you can spot problems before they happen.
You can keep your old apps working while you add new features in .NET 10.
.NET 10 has tools that help you work faster and easier. Debugging in Visual Studio is better now. Error handling is simpler to understand. There is strong support for containers. Your apps run smoother and use less memory. This is true even when many people use them. Security is stronger with new ways to log in and encrypt data.
You can build, test, and deploy with more confidence. You do not need as much effort. .NET 10 helps you work smarter every day.
FAQ
What is the main benefit of upgrading to .NET 10?
Your apps run faster and are safer. You can put your apps in the cloud more easily. .NET 10 helps you write code quickly. You spend less time managing your projects.
What does C# 14 add to my workflow?
C# 14 gives you extension members and field-backed properties. Pattern matching is better now. You write less code and keep things neat.
What is script mode in the .NET 10 CLI?
Script mode lets you run C# files from the terminal. You can try out ideas or automate tasks. You do not need to make a whole project.
What makes Minimal APIs better in .NET 10?
Minimal APIs let you group endpoints and check data better. You organize routes easily. You can make clear API docs.
What security features does .NET 10 include?
.NET 10 adds post-quantum cryptography and new security tools. You keep your apps safe from new threats. You meet modern security rules.
