Evolve your development: why move from VB6 to .NET

Visual Basic (VB) is an event-driven programming language created by Microsoft in 1991, it derives from BASIC born way back in 1964 where computers were bulky, extremely expensive and difficult to program.

Basic stands for “Beginners All-purpose Symbolic Instruction Code” which translated means: “All-purpose symbolic instruction code for beginners”.

It was designed to be easy to learn, emphasizing ease of use over expressive power, so it could be used even by beginners. The instructions were few and not complex and offered few structured constructs to make everything as simple as possible.

Subsequently, the word Visual was added because it focused on rapid application development (RAD) with the drag-and-drop technique starting from the creation of the actual graphic user interface: Graphical User Interface or GUI.

Visual Basic 6.0 (VB6) was released in mid-1998, designed to suit the processors of the time, it began to support the object-oriented language, but with many limitations.

It was designed to start from a widget to compose the graphical interface. For example, you dragged a button to click onto the drawing screen and then wrote the code to trigger the event that was supposed to generate the mouse click.

With VB6 it was possible to develop a considerable amount of software applications for the Windows operating system, for which it was designed and there are still online courses, albeit very few.

Here is a short list of what it allows you to do:

• Desktop applications for Windows
• Automate tasks with scripts
• Simple graphical interfaces

Why VB6 is outdated for developing applications in 2026

Microsoft, despite having developed Basic and then Visual Basic up to version 6.0, then decided to move towards a different development model, releasing the modern .NET framework.

It provided support for the VB IDE (Integrated Development Environment) until 2008. Afterwards it exclusively carried out the development of the new VB.NET language thanks to the .NET Framework.

There was a period of parallel support of the two languages between 2001 and 2008 to allow all those developers who had used VB to migrate to VB.NET and keep up with the most recent developments of the time.

This should already make you think about the possibility of having support in 2024 for a language that “dead” in 2008.

Read on and I'll tell you all the reasons why you should stop using VB and migrate to .NET!

Below are the top 6 reasons:

1. Obsolete

   As you may have understood by now, support ceased from Microsoft in 2005. Which means that official updates or security patches are no longer released, so reliability and scalability have been very limited for several years.

2. Limitations in OOP

   VB6 supports object-oriented programming, but in a very limited way.

   For example, it does not support complete inheritance and polymorphism, essential elements for creating more complex software architectures as we often need to develop.

   However, they can be used with C#.

3. Very limited performance

   Applications developed in VB6 tend not to be optimized for high performance.

   It doesn't natively support multithreading and asynchronous programming, so you have to find workarounds to create something similar with all the reliability problems of something handcrafted and not tested over and over again.

4. No portability

   VB6 is closely linked to Windows therefore, given the countless operating systems present today (Linux, macOS, Android etc.) it is not wise to use a language that does not allow a single code to run on all operating systems.

   This is possible with .NET and its frameworks (MAUI, Xamarin, Unity).

5. Code maintenance

   Code written in VB6 is not easy to maintain because there is no built-in automatic refactoring or version control.

   Architecture also tends to quickly become disorganized and difficult to manage.

   You understand well that on complex projects it can be an immense waste of time (and money) trying to maintain a project in which new features must be implemented.

6. Compatibility

   Applications in VB6 often suffer from incompatibility with new versions of Windows and modern applications.

   Due to the fact that it uses technologies and libraries that are no longer supported or even no longer present in more recent versions of Windows.

VB6 was a very powerful and revolutionary tool in the period in which it was developed, but with the growing demand for increasingly faster and more flexible software, it has encountered its objective limits in recent years.

Given the numerous disadvantages that I have just listed, it is not a good choice to use VB6 to develop a modern and scalable application as the market requires today.

How to migrate to .NET from VB6

Migrating from VB6 to .NET can be a complex operation, especially for already structured and complex projects, but with the right planning and using appropriate tools it can be a huge leap in quality.

Here are the 4 main points to follow to migrate your VB6 projects to .NET in an organized manner:

1. Evaluation
2. Planning
3. Migration
4. Tests

The first thing to do is evaluate the complexity of the project, the dependencies on obsolete libraries and the available budget to determine if migration is the best choice. Sometimes redoing is more convenient, even in terms of time, than trying to fix.

Subsequently, the objectives must be defined, paying particular attention to:

• Ability to include performance, security and maintainability improvements and update to the latest technologies.
• Create a migration plan, as detailed as possible, that defines the steps of the process, the resources needed and the timing.

At this point you have a perfect map of the path you need to take for migration, all you have to do is follow it.

Naturally, the more detailed and precise it is done, the easier it will be to follow.

From the evaluation and planning part we move on to the technical part of the migration process.

Do a static analysis of VB6 code, especially with the use of modern automated tools that can make finding areas of code with .NET compatibility issues much faster.

Identify dependencies on third-party libraries and components by evaluating whether compatible alternatives exist in .NET.

Very important advice before proceeding: create a backup copy and use a source control system, such as Git, to track the changes during the migration and have the possibility to go back if the changes made don't work!

From here on, there are many modern automated tools that allow you to migrate parts of code automatically.

Obviously you cannot do a simple "copy and paste", but it is a meticulous job that must be done one piece at a time, testing the changes just made as frequently as possible.

The advantages of .NET over VB6

The advantages that you have by exploiting all the power of .NET are so many, but here I want to describe only the most significant ones and for which you should no longer have doubts and migrate your projects from VB6 to .NET.

Here are the 5 most important features of .NET divided by topic area:

1. Development paradigm

• Modern and object-oriented

  It is based on the principles of object-oriented programming, promoting code reusability, modularity and maintainability.

• Strongly typed

  It enforces rigorous type checking, significantly reducing runtime errors and making code more robust and reliable.

• Automatic memory management

  Automatically manages allocated and deallocated memory, eliminating the need for code written specifically for memory management. Doing so reduces the risk of memory leaks and crashes.

2. Performance

• Greater speed and scalability

  .NET applications are generally faster due to compilation to native machine code and runtime optimization. .NET is scalable and suitable for managing complex, high-workload software.

• Managed execution

  It runs code within an environment managed by the common language runtime (CLR), which provides services such as memory management, exception handling, and security. This increases reliability and simplifies development.

3. Functionality

• Extensive library framework: There is an immense framework of ready-to-use libraries and classes that cover an immense range of functionality. From databases, to networking, to graphics, to security and web development for example.
• Support for different technologies: .NET supports various technologies such as XML, XAML, SOAP, ASP.NET, WPF and these are just some of those available. It is thus possible to create feature-rich desktop and mobile applications.
• Interoperability

  .NET is interoperable with different languages such as C++ or C# as well as with different technologies.

  This facilitates the reusability of the code and the integration with existing systems.

4. Development and maintenance

• Visual Studio

  A complete, feature-rich IDE that makes developing, debugging, and maintaining applications a breeze.

• Active community

  There is a large community of developers providing support, resources, and open-source libraries.

5. Future support

• Continuous development

  Microsoft, an IT giant for almost 50 years, continues to develop and update .NET with new features and performance improvements.

.NET represents the absolute best tool for developing modern, scalable, maintainable and feature-rich applications. To learn it in depth, explore our complete .NET course.

Get started right away with i first steps with C# and learn to become a software developer with the most requested technologies on the market!