Convert VB.NET to a Web App | Legacy Migration
To migrate a VB.NET or WinForms desktop application to the web, you rebuild its business logic in a modern web framework, keep and migrate your existing database, and deliver a browser-based app that runs on any device. We do not machine-translate the old code line by line. Instead, we audit what the application actually does, re-implement the rules and workflows cleanly on a modern stack, and move your data across intact so your team keeps working without losing history.
Why VB.NET and WinForms are a liability now
WinForms apps built on the .NET Framework and deployed with ClickOnce were fine for their era, but they now hold your business back. They install per machine, break with each Windows update, and are hard to use outside the office. Every new hire needs a manual setup, and remote access usually means clumsy VPN or remote-desktop workarounds.
- Platform lock-in: WinForms runs only on Windows desktops, never on phones, tablets, or Mac.
- Deployment pain: ClickOnce updates fail silently and leave users on old, inconsistent versions.
- Scaling limits: concurrent multi-user access to a shared file or Access database becomes fragile as your team grows.
- Talent risk: fewer developers want to maintain aging .NET Framework WinForms code.
Our migration approach: rebuild the logic, keep the data
The most important decision in a rescue project is how you treat the old code. Automated converters that turn WinForms into web pages produce brittle, unmaintainable output. We take a cleaner path: we extract and re-implement your business logic on a modern web framework, so the result is genuinely web-native rather than a desktop app forced into a browser.
Your data is never thrown away. We map your current schema and migrate every record, so day one on the new system feels familiar. If you are weighing the trade-offs, our guide on web versus installed software explains why a browser-based build wins for most teams. This work is part of our wider legacy software rescue service.
What you get
- Web and mobile: one responsive app that works in any browser, on desktop and phone.
- Real concurrency: 50 or more users working at once against a proper server database.
- Role-based access: permissions per user and per role, with a full audit trail.
- Automatic backups: scheduled, tested backups instead of a file someone copies by hand.
- Central updates: you deploy once and everyone is instantly on the latest version.
How the project runs
We work remotely with English-language support throughout, and we are transparent about that: no fake local office, no invented certifications, just a clear engineering process.
- Audit: we review your VB.NET code, forms, and database to map every feature and rule.
- Rebuild: we re-implement the logic and screens as a modern web application.
- Data migration: we move all your records into the new database and verify them against the old system.
- Training and handover: we train your team and support the go-live.
If your project also needs features the old tool never had, we can extend the scope through our custom software development service.
Frequently Asked Questions
Can you reuse our old VB.NET code?
We reuse the knowledge in it, not the code itself. We study your logic and rules carefully, then re-implement them cleanly for the web. Direct machine conversion produces fragile results, so we avoid it.
Will we lose any data?
No. Migrating your data intact is a core part of the project. We map your current schema, move every record, and verify the new database against the old one before go-live.
How long does a migration take?
A small WinForms tool can move in a few weeks, while a large multi-module app takes a few months. After the audit we give you a firm timeline and milestones.
Do we keep our existing database?
Yes, wherever it makes sense. We can keep your SQL Server database and connect the new web app to it, or migrate to a modern engine if your current setup limits growth.
