VB.NET and Legacy Systems: Keep, Migrate or Replace
Not every aging system should be rewritten. I help you decide what to keep, what to move to C# and modern .NET, and what to replace, and then I do the work in small, safe steps.
Three options, and how to choose
Keep and stabilize
If it works and rarely changes, leave the code alone: update the runtime, add tests around what matters and fix the deployment process.
Migrate to C# and modern .NET
Convert module by module, with tests around each one. Business logic in VB.NET libraries can often be reused while the web layer is rebuilt in C#.
Replace it
When the system no longer fits the business, new custom software can cost less than keeping it alive. The Audit tells you which case you are in.
Why VB.NET systems get harder over time
- Microsoft keeps supporting VB.NET but does not evolve the language.
- Fewer developers want to work in it, so hiring and onboarding get harder.
- New libraries and examples are written in C#.
- Modernizing the platform often means touching the VB code anyway.
How I approach it
- Take inventory What the system does, who uses it, what breaks and what costs the most to change.
- Decide per module Keep, migrate or replace each part, not the whole system at once.
- Make changes safe Tests around the critical behavior and a repeatable deployment, before touching the code.
- Move in slices One module at a time. Tools can translate VB.NET to C#, but the result is reviewed and tested.
I use AI-assisted development to move faster, and every change is reviewed and tested.
Where to start
From USD 2,000, fixed.
The Audit reviews your system in one week and tells you what to keep, migrate or replace, with a phased roadmap and a cost estimate. You decide what to do with the report.
Experience
- More than 20 years working with .NET, including the WebForms, jQuery and VB.NET era at HotelDO.com (2005–2014).
- At HotelDO.com I built and maintained the core booking and CMS systems of a major online travel agency, used by thousands of people every day.
Frequently asked questions
Should I convert my VB.NET code to C#?
Not always. If the system is stable and rarely changes, stabilizing it may be enough. Conversion makes sense when you need to hire, extend or move the platform, and it is done module by module with tests around each one.
Do you work on VB.NET code?
Yes. I have built and maintained ASP.NET systems in both VB and C# for many years.
What about Classic ASP or VB6?
Those are older technologies with no direct upgrade path, so they usually need a staged replacement rather than a conversion. The Audit tells you what is realistic for your system.
Where do I start?
With the one-week, fixed-price Audit. You get a report on risks, target architecture, roadmap and cost, and you decide what to do next.
Not sure whether to keep it, migrate it or replace it?
Book a free 30-minute call and tell me about your system. We will see whether the Audit makes sense for your case.