.NET modernization
.NET Framework migration: find the blockers before you commit.
Moving from .NET Framework to modern .NET is mostly a dependency and API question. We assess it first, then migrate in small, tested steps.
- principles on every project
- 8
- AceMQ support after go-live
- 24/7
- price assessment first
- Fixed
- AceMQ engineering since
- 2016
The short answer
.NET Framework migration moves applications from the Windows-only .NET Framework to modern .NET, such as .NET 8. Most of the effort is in unsupported libraries, Web Forms, WCF and other Windows-specific APIs. Ace8 starts with a fixed-price assessment, uses AI-assisted tooling with engineer review, and works with a vetted specialist partner where .NET depth is needed.
Customers
Partners
01Definition
What is a .NET Framework migration?
It means moving an application from .NET Framework, which runs on Windows, to modern .NET (.NET 8 and later, formerly called .NET Core), which is cross-platform and actively developed. It is a port of the application to a different runtime, not a version bump, and it can be done in steps.
The step that comes first is deciding whether each application should move at all, be replaced or retired. See application portfolio rationalization.
02Reasons
Why move off .NET Framework?
- Modern .NET receives the performance, security and language improvements. .NET Framework is maintained for compatibility.
- Linux and container hosting can cut licence and infrastructure cost.
- New libraries and cloud SDKs increasingly target modern .NET only.
- Hiring and onboarding are easier on the current platform.
- Smaller deployments and faster start-up help in containers.
03Blockers
What usually blocks the migration?
Check each row against the Microsoft documentation for the exact versions you run.
| Blocker | Why it matters | Usual direction |
|---|---|---|
| ASP.NET Web Forms | No direct equivalent in modern .NET | Rewrite UI incrementally, often to Razor Pages, MVC or a front-end framework |
| WCF services | Server-side WCF is not part of modern .NET | Move to gRPC or HTTP APIs, or use a community port for a bridge |
| Old third-party libraries | No modern .NET build available | Replace, update or isolate behind an interface |
| Windows-only APIs | Registry, COM, GAC and similar tie code to Windows | Abstract them, or keep the component on Windows |
| System.Web dependencies | Used across older ASP.NET code | Remove step by step with an adapter during the move |
| Thin test cover | No way to prove behavior is unchanged | Add characterization tests first |
04Route
In what order should the migration be done?
Moving the leaves first and the entry points last lets you ship in small, reversible pieces. This is the same strangler approach we use for Java; see the strangler fig pattern.
- 01
Inventory and score
List applications, projects and dependencies. Run compatibility analysis and rank by blockers and business value.
- 02
Add tests
Cover the behavior you cannot afford to change before any code moves.
- 03
Move shared libraries
Retarget class libraries to a version both runtimes support, then to modern .NET.
- 04
Port the application
Move services and web layers one at a time, with the old and new running side by side where needed.
- 05
Cut over and run
Plan monitoring, deployment and rollback. AceMQ provides 24/7 support after go-live.
05Tooling
Where do tools help, and where do they stop?
Compatibility analyzers, upgrade assistants and AI-assisted services can find incompatible APIs, convert project files and propose code changes. They save time on repetitive edits. They do not remove the need to choose a target for Web Forms or WCF, and they cannot prove behavior is unchanged.
We treat tool output as a draft: tests must pass and an engineer reviews each change. For one such service, see AWS Transform for .NET.
06Delivery
Who delivers the .NET work?
Ace8's core experience is Java, application servers, databases and cloud-native platforms. For .NET we work with a vetted specialist partner where the engagement needs deep Framework or Web Forms knowledge, and the proposal says who does what. Ace8 is accountable for the assessment, the test approach, the review gates and the plan.
The assessment will also tell you how much of the estate is straightforward and how much needs specialist hands.
07Evidence
What have we measured?
Ace8 has not yet published a .NET migration, a tool run on a sample .NET application or any customer result for this service. Until we do, this page makes no claims about speed, accuracy or cost. Published runs on Java tools are in the tools benchmark.
08Next step
What should you do first?
Start with the modernization assessment: applications by route, blockers, effort ranges and a fixed price for phase one, with no commitment to continue. For what drives the price, see application modernization cost.
After go-live
Keep it running after cutover.
.NET Framework is the Windows-only platform that is maintained for compatibility. .NET 8 is modern, cross-platform .NET, formerly known as .NET Core.
Not directly, because there is no Web Forms in modern .NET. The UI is moved or rewritten, often one page at a time, to another web framework.
It depends on blockers, test cover and the number of applications. We give effort ranges after the assessment, not before.
Not yet published. Where an engagement needs .NET depth we deliver with a vetted specialist partner, and the proposal names who does what.
They can draft much of the mechanical change. Tests and engineer review decide whether it is correct, and design choices stay with people.
Start here
Know the cost before anything moves.
A fixed-price assessment gives you the inventory, the risk score and a phased plan. Scope and cost are fixed before the migration starts.
Get in touch
Talk to a modernization engineer
Tell us what you run today. An engineer, not a sales script, replies within one business day.