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January 03, 2026

C# & .NET · 15 min read

Migrating from .NET Framework to .NET 8: Lessons Learned

A practical guide to migrating legacy .NET Framework applications to .NET 8, including common pitfalls, migration strategies, and performance improvements we've seen.

Jax Harlen

Jax Harlen

@JaxHarlen

Why Migrate to .NET 8?

.NET 8 offers significant performance improvements, better container support, and access to modern C# features. For enterprises still on .NET Framework, the migration path is now well-established.

Assessment Phase

Before starting any migration, assess your application's dependencies. Use the .NET Upgrade Assistant to identify compatibility issues with NuGet packages and Windows-specific APIs.

Incremental Migration Strategy

Don't try to migrate everything at once. We recommend starting with shared libraries, moving to service layers, and finally tackling the presentation layer.

Handling Windows-Specific Code

If your application uses Windows-only features like Registry access or Windows Forms, you have options: abstract these behind interfaces, use the Windows Compatibility Pack, or consider Windows-only deployment targets.

Performance Improvements

In our migrations, we've consistently seen 20-40% performance improvements out of the box. The new JIT compiler, improved garbage collection, and optimized BCL methods make a real difference.

Container Deployment

One of the biggest benefits of .NET 8 is first-class container support. We'll show you how to create optimized Docker images that leverage multi-stage builds and the new chiseled images.

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