What’s New in .NET 10 — A Complete Guide for Developers (2025)

sharepointcafe

December 27, 2025

Share with

.NET 10 is the latest Long-Term Support (LTS) release from Microsoft, launched in November 2025. It represents a major milestone in the evolution of the .NET platform — bringing significant advancements in performance, developer productivity, security, cloud-native support, and AI integration. As an LTS release, .NET 10 will be supported through November 2028. Wikipedia

In this article, we’ll explore all the key new features in .NET 10, why this release matters, and how you can start using them with practical examples in C#.

👉 For more details and official docs, visit Microsoft’s .NET 10 overview:
🔗 https://learn.microsoft.com/dotnet/core/whats-new/dotnet-10/overview

🚀 1. .NET 10 Overview

.NET has evolved beyond just a runtime — it’s now a unified platform for building cloud, desktop, mobile, web, gaming, AI, and IoT apps. .NET 10 continues this vision with a focus on:

Performance gains across runtime and JIT compilation
AI integration and tooling improvements
Web and API enhancements
Security updates
Cloud and container optimizations
Developer productivity boosts

🔥 2. Major Performance Enhancements

Performance takes center stage in .NET 10.

☑️ JIT & Runtime Optimization

The JIT compiler and runtime have received low-level enhancements that improve execution speed, reduce memory usage, and optimize frequently executed code paths. This includes:

Improved loop inversion and better analysis
Optimized method inlining
Reduced garbage collection overhead
Efficient struct handling and feedback-driven optimizations Microsoft Learn+1

These changes make applications noticeably faster than previous versions.

Example: Benchmarking Performance

// Simple benchmark example
var watch = System.Diagnostics.Stopwatch.StartNew();

for (int i = 0; i < 1_000_000; i++)
{
    var s = $"{i}";
}

watch.Stop();
Console.WriteLine($"Time taken: {watch.ElapsedMilliseconds} ms");

Use benchmarks like this to compare performance across .NET versions.

🧠 3. Built-in AI Integration

.NET 10 introduces built-in support for AI workflows, allowing developers to build intelligent applications with less effort:

New frameworks simplify composing AI agents and workflows
Integration with machine learning libraries and cognitive services
AI enhancements in tooling (Visual Studio and VS Code) Visual Studio Magazine

These features empower developers to create powerful AI solutions in .NET without complex third-party stacks.

🌐 4. ASP.NET Core 10 — Web Development Made Easier

ASP.NET Core receives a major update in .NET 10 with improved APIs and increased productivity.

🧩 Minimal API Enhancements

Minimal APIs now include built-in validation with attributes, similar to controllers:

app.MapPost("/products", 
    ([Required, Range(1, 1000)] int id, [Required] string name) =>
        Results.Ok(new { id, name }));

You can also disable validation on specific endpoints using .DisableValidation() if needed. DEV Community

🚀 Server-Sent Events (SSE)

SSE allows real-time streaming of server updates to clients:

app.MapGet("/stream", (HttpContext context) =>
    Results.ServerSentEvents(async response =>
    {
        await response.WriteAsync("data: Hello World\n\n");
    }));

📄 OpenAPI 3.1 + YAML Support

.NET 10 improves OpenAPI support and adds YAML serialization for API specs:

builder.Services.AddOpenApi(o => o.OpenApiVersion = Microsoft.OpenApi.OpenApiSpecVersion.OpenApi3_1);

These enhancements make API documentation and tooling more powerful.

🛡️ 5. Security & Authorization Enhancements

Security is tighter in .NET 10:

Enhanced phishing-resistant credential support
Improved observability
Better authentication/authorization developer experience Auth0

These upgrades help you build secure applications confidently.

💻 6. Developer Productivity Features

.NET 10 improves productivity in many ways:

📦 NuGet Security Auditing

.NET now includes advanced NuGet package auditing, giving warnings for vulnerable dependencies and helping maintain secure builds.

🧰 Tooling & SDK Improvements

The .NET SDK introduces new templates and CLI enhancements. Combined with updates to Visual Studio 2026, developers can build, test, and debug faster and more seamlessly.

📊 7. Enhanced Libraries & APIs

.NET 10 brings numerous library upgrades:

🔡 Data and Text Improvements

Better handling of strings, dates, and Unicode processing.

🔄 JSON Serialization Updates

More flexible and safe JSON serialization, including enhanced reference handling mode.

🔒 Certificate Management

New methods and secure defaults make certificate handling more robust.

🏎️ 8. Cloud-Native and Cross-Platform Scale

.NET 10 delivers stronger support for modern deployment patterns:

Better Docker and Kubernetes integration
Reduced memory footprint for cloud apps
Scalable microservice workflows
Unified cross-platform developer experience

🧪 9. Sample: Building a Minimal API in .NET 10

Here’s a simple .NET 10 minimal API to get you started quickly:

var builder = WebApplication.CreateBuilder(args);
var app = builder.Build();

// Endpoint with built-in validation
app.MapPost("/todo", 
    ([Required] string title, bool done) => Results.Ok(new { title, done }));

app.Run();

📌 Conclusion

.NET 10 is a powerful, performance-first, and future-ready framework. With improvements from the runtime to cloud frameworks, web development to security, this LTS release empowers developers to build faster, smarter, and more secure applications.

Whether you’re building APIs, cloud services, AI solutions, or enterprise systems, .NET 10 is a compelling upgrade with long-term support and modern capabilities.

👉 Learn more on the official Microsoft .NET 10 page:
🔗 https://learn.microsoft.com/dotnet/core/whats-new/dotnet-10/overview

Keep Following: SharePointCafe.NET

Tagged in :