Migrating from legacy ASP.NET to .NET 8 can seem challenging, but it can be simplified with a structured approach:
- Assessment: Analyze your existing application’s structure, dependencies, and external integrations.
- Preparation: Upgrade legacy libraries and NuGet packages to compatible versions first.
- Code Migration: Gradually migrate WebForms or MVC pages to Razor Pages or Blazor.
- Refactoring: Improve your application structure during migration (consider Clean Architecture).
- Testing: Continuously test each migration phase to catch issues early.
- Deployment: Use incremental deployment to production with thorough monitoring.
Migrating incrementally minimizes risk and maintains continuous delivery of business value.
That incremental approach works best when the first boundary is chosen around a real business constraint rather than a preferred technology. The rewrite-or-modernise decision framework explains how to choose that boundary, while the legacy platform case study shows how the approach can be applied to a long-lived business-critical system.
