Palm LeavesWe upgrade .NET Framework, Web Forms, MVC 5 and WCF applications to modern .NET one section at a time, with old and new running side by side behind the same URLs. Typical programmes take six to sixteen weeks.
Many corporate applications still run on .NET Framework 4.x, Web Forms or WCF. They work, but they are tied to Windows hosting, harder to hire for and miss the performance gains of modern .NET.
We upgrade section by section using the strangler-fig pattern: new .NET 10 modules sit alongside the old app behind the same URLs until everything has moved. Users see the same screens, only faster.
Tick what applies to your application.
Most of the code should port directly. We would start with an automated analysis and a short spike.
Scope, price and timeline are fixed in writing before work starts.
Inventory of content, data, integrations and every live URL.
Every page, field and redirect mapped to the new platform.
Full trial migrations on staging until the numbers reconcile.
A planned window with a tested rollback, agreed in advance.
Daily checks on traffic, errors and data after launch.
What usually goes wrong with .net & web forms migration projects, and what we do about it.
Routes move across one at a time behind the same domain.
Behaviour is captured in tests before each section is rewritten.
Windows-only dependencies are flagged in the audit so you can choose Linux hosting later.
An internal claims application runs on Web Forms and WCF on .NET Framework 4.8. Weeks one and two audit every page, service and dependency, and rank sections by risk and value.
A modern .NET application is placed in front of the old one. Each sprint moves one section across, with tests capturing existing behaviour first. Users keep the same address throughout.
An illustrative example of how we would run this kind of project, not a client case study.
| Keep and support | Incremental migration | Full rewrite | |
|---|---|---|---|
| Risk | Low now, growing | Low | High |
| Disruption to users | None | Minimal | One large cutover |
| Time to first benefit | Immediate | Weeks | Months |
| End state | .NET Framework on IIS | Modern .NET | Modern .NET or another stack |
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