VB vs. VB.NET: Key Differences Every Developer Must Know
VB (Visual Basic 6) is a 1998-era, COM-based RAD tool that compiles to native code; VB.NET is its 2002 successor running on the .NET CLR, fully object-oriented and JIT-compiled.
Recruiters and Stack Overflow posts still say “VB developer” without clarifying version, so legacy teams inherit ancient .exe files while new hires expect NuGet packages—causing rifts in code reviews and salary negotiations.
Key Differences
VB uses single-threaded apartments, P-code compilation, and DAO/ADO classic; VB.NET leverages garbage collection, generics, async/await, and the full .NET ecosystem, breaking most VB APIs.
Which One Should You Choose?
New project? Pick VB.NET for cloud, cross-platform, and long-term support. Tending a 90s payroll system? Keep VB6 alive via COM interop until a rewrite is cheaper than risk.
Examples and Daily Life
Imagine opening a VB6 POS app that still prints receipts on dot-matrix printers—then switching to VB.NET with SignalR for real-time sales dashboards on tablets. Same origin, two eras.
Can VB6 code run inside VB.NET?
No; upgrade wizard ports syntax, but runtime and ActiveX controls must be re-written or wrapped via interop.
Does VB.NET still use “On Error Resume Next”?
It’s syntactically allowed, yet frowned upon; structured Try/Catch is the modern pattern for maintainability.
Which IDE supports VB today?
VB6 lives in the retired Visual Studio 6 IDE; VB.NET works in Visual Studio 2022 with full IntelliSense and Git integration.