Visual Basic (.NET)

People use code to make computer apps. One way is called Visual Basic. It helps people build things for Windows.

You can drag and drop buttons on a screen. This makes it easy to work. You can also change how things look. You can change the color or the size. This helps you make a new app. You can even make a button move. It stays in the right spot on the screen. Making apps is a fun way to use code.

Visual Basic is a way to write code. People use it to make computer apps. Microsoft first launched it in 2002. This version is called Visual Basic .NET. It is part of a big group of tools called .NET.

One way to use it is with Windows Forms. This helps people make apps for Windows computers. You can use a tool called Visual Studio to build them. You can drag and drop parts onto a screen. These parts are called controls. You might use a button or a text box. Each control has its own traits. You can change its color, size, or font. You can also tell the control what to do when someone clicks it. This is called an event handler. For example, a button can show a message box. A message box is a small window that shows text.

Writing code follows specific rules. These rules are called syntax. You use statements to tell the computer what to do. You can use loops to repeat tasks. You can also use 'If' statements to make choices. This makes your app work in many ways.

Visual Basic is a special way to write code for computers. It is a programming language used to build many different types of software. Microsoft created this version, called Visual Basic .NET, in the year 2002. It was made to follow an older version known as Visual Basic 6.0. Today, it is one of three main languages used in the .NET ecosystem. This system helps different programs work together smoothly.

One way people use this language is to make desktop apps for Windows. They often use a tool called Windows Forms to do this. Developers use a program called Visual Studio to design how the app looks. In Visual Studio, you can drag and drop parts onto a window. These parts are called controls, such as buttons or text boxes. Every control has special traits like its color, size, or font. You can also write code for an event handler. This tells the control what to do when someone clicks or drags it.

Writing code requires following very specific rules called syntax. You use statements to tell the computer exactly what actions to take. Some statements are simple, like an expression on a single line. Other statements help the program make decisions or repeat tasks. For example, an "If...Then" statement lets the program choose a path. A "For Each" statement lets the program step through a list of items. You can even use loops, like a "Do...Loop," to repeat a job many times.

Visual Basic has changed quite a bit over the years. In the newer .NET versions, some numbers can be much larger. The Integer type is now 32 bits long instead of 16 bits. The Long type grew from 32 bits to 64 bits. This helps the computer handle much bigger pieces of information. Microsoft also changed how the language handles objects. It now uses the .NET Framework to run its programs. This framework includes a part called the Common Language Runtime.

Learning this language is a bit like building with blocks. You use different modules to act as containers for your code. A module can hold variables, functions, or other parts of a program. You can even write a very simple program to say "Hello, World!" to a user. This is a classic way for beginners to start coding. You can show this message in a command-line window or a small pop-up box. These boxes are called message boxes, and they make interacting with computers feel very natural.

Visual Basic, often called VB.NET, is a multi-paradigm, object-oriented programming language. Microsoft developed this language to serve as a successor to the original Visual Basic. It is implemented on several platforms, including .NET, Mono, and the .NET Framework. This language is one of three primary languages used within the .NET ecosystem. It works alongside other languages like C# and F# to target this specific environment.

To understand how Visual Basic works, we must look at its syntax and structure. Programming requires following specific rules called syntax to communicate with a computer. In Visual Basic, developers use statements to specify exact actions. The most common type is an expression statement, which evaluates an idea on a single line. To manage how a program moves through these steps, the language uses control-flow statements. These are identified by reserved keywords that change the normal order of execution. For example, conditional constructs like "If...Then...Else" allow the program to make decisions based on certain conditions.

Visual Basic also uses iterative execution constructs, which are often called loops. These allow a program to repeat a task multiple times. There are four main types: "Do...Loop," "For...To," "For Each," and "While...End While." The "For...To" statement is unique because it requires both an initialisation section and a testing section. The "For Each" statement is used to step through every individual value in a list. To keep code organized, the language uses specific keywords to start and end blocks of code. For instance, a "Sub" block must eventually end with an "End Sub" keyword.

One of the most popular uses for Visual Basic is creating Graphical User Interfaces, or GUIs. A GUI is the visual part of a program that a person interacts with, like buttons and windows. Developers often use the Windows Forms library to build these interfaces for Windows desktop applications. This process usually happens within an Integrated Development Environment, or IDE, called Visual Studio. Inside Visual Studio, programmers use a drag-and-drop method to place controls on a form. These controls include elements like text boxes and buttons. All these visual elements derive from a single base called the Control class. This class provides basic traits like size, color, font, and location. It also handles common events, such as when a user performs a click or a drag-and-drop action.

The history of this language involves a major shift in how it functions. Microsoft launched VB.NET in 2002 to replace the classic Visual Basic 6.0. This transition changed the language from being object-based to being fully object-oriented. It moved from a system called COM to the more powerful .NET Framework. This new framework includes the Common Language Runtime, which is a virtual machine. This machine uses a process called just-in-time compilation and a system called generational garbage collection. Because of these changes, many old applications required refactoring, which means rewriting parts of the code to work correctly in the new system.

Significant technical changes occurred during the move to .NET, especially regarding data types. In the older Visual Basic 6.0, the Integer data type was only 16 bits long. In VB.NET, this size was doubled to 32 bits. Similarly, the Long data type grew from 32 bits to 64 bits. To maintain compatibility with the old 16-bit size, VB.NET uses a new name called "Short." These larger data types allow the computer to process much larger numbers more efficiently. These improvements are a core part of why the language evolved into its modern form.

Visual Basic also uses modules to organize its code. A module acts as a container that holds different pieces of code, such as variables or functions. While modules can hold many things, they cannot be instantiated as objects like classes can. They serve as a way to group code so it can be easily referenced by other parts of a program. A classic way to test a new program is to write a "Hello, World!" application. This simple program uses a module and a subroutine called "Main" to print text. This "Main" subroutine serves as the entry point, which is where the computer begins executing the code.

Today, the role of Visual Basic has reached a stable point in its lifecycle. On February 6, 2023, Microsoft announced its updated strategy for the language. They stated that Visual Basic is now a stable language and they will continue to maintain it. However, Microsoft will not add support for new workloads to the language. This means that while the language will continue to work, it will not receive many new features. It remains a significant tool for developers working within the established .NET ecosystem.