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Visual Basic .NET (VB.NET) is a multi-paradigm, object-orientedprogramming language, implemented on the .NET Framework. Microsoft launched VB.NET in 2002 as the successor to its original Visual Basic language. Although the '.NET' portion of the name was dropped in 2005, this article uses 'Visual Basic [.NET]' to refer to all Visual Basic languages released since 2002, in order to distinguish between them and the classic Visual Basic. Along with Visual C#, it is one of the two main languages targeting the .NET framework.

Microsoft's integrated development environment (IDE) for developing in Visual Basic .NET language is Visual Studio. Most Visual Studio editions are commercial; the only exceptions are Visual Studio Express and Visual Studio Community, which are freeware. In addition, the .NET Framework SDK includes a freeware command-linecompiler called vbc.exe. Mono also includes a command-line VB.NET compiler.

• 1Syntax
  • 1.3Comparison with the classic Visual Basic
• 2Examples
  • 2.1Hello World!
  • 2.2Speaking
• 3Version history

Syntax[edit]

VB.NET uses statements to specify actions. The most common statement is an expression statement, consisting of an expression to be evaluated, on a single line. As part of that evaluation, functions or subroutines may be called and variables may be assigned new values. To modify the normal sequential execution of statements, VB.NET provides several control-flow statements identified by reserved keywords. Structured programming is supported by several constructs including two conditional execution constructs (If … Then … Else … End If and Select Case ... Case ... End Select ) and three iterative execution (loop) constructs (Do … Loop, For … To, and For Each) . The For … To statement has separate initialisation and testing sections, both of which must be present. (See examples below.) The For Each statement steps through each value in a list.

In addition, in Visual Basic .NET:

• There is no unified way of defining blocks of statements. Instead, certain keywords, such as 'If … Then' or 'Sub' are interpreted as starters of sub-blocks of code and have matching termination keywords such as 'End If' or 'End Sub'.
• Statements are terminated either with a colon (':') or with the end of line. Multiple line statements in Visual Basic .NET are enabled with ' _' at the end of each such line. The need for the underscore continuation character was largely removed in version 10 and later versions.^[4]
• The equals sign ('=') is used in both assigning values to variables and in comparison.
• Round brackets (parentheses) are used with arrays, both to declare them and to get a value at a given index in one of them. Visual Basic .NET uses round brackets to define the parameters of subroutines or functions.
• A single quotation mark (') or the keyword REM, placed at the beginning of a line or after any number of space or tab characters at the beginning of a line, or after other code on a line, indicates that the (remainder of the) line is a comment.

Simple example[edit]

The following is a very simple VB.NET program, a version of the classic 'Hello world' example created as a console application:

It prints 'Hello, world!' on a command-line window. Each line serves a specific purpose, as follows:

This is a module definition. Modules are a division of code, which can contain any kind of object, like constants or variables, functions or methods, or classes, but can't be instantiated as objects like classes and cannot inherit from other modules. Modules serve as containers of code that can be referenced from other parts of a program.^[5]
It is common practice for a module and the code file, which contains it, to have the same name; however, this is not required, as a single code file may contain more than one module and/or class definition.

It defines a subroutine called 'Main'. 'Main' is the entry point, where the program begins execution.^[6]

This line performs the actual task of writing the output. Console is a system object, representing a command-line interface (also known as 'console') and granting programmatic access to the operating system's standard streams. The program calls the Console method WriteLine, which causes the string passed to it to be displayed on the console.

Instead of Console.WriteLine, one could use MsgBox, which prints the message in a dialog box instead of a command-line window.^[7]

Complex example[edit]

This piece of code outputs Floyd's Triangle to the console:

Comparison with the classic Visual Basic[edit]

Whether Visual Basic .NET should be considered as just another version of Visual Basic or a completely different language is a topic of debate. There are new additions to support new features, such as structured exception handling and short-circuited expressions. Also, two important thing to do with respect to performance and maintainability. Some functions and libraries no longer exist; others are available, but not as efficient as the 'native' .NET alternatives. Even if they compile, most converted Visual Basic 6 applications will require some level of refactoring to take full advantage of the new language. Documentation is available to cover changes in the syntax, debugging applications, deployment and terminology.^[8]

Comparative examples[edit]

The following simple examples compare VB and VB.NET syntax. They assume that the developer has created a form, placed a button on it and has associated the subroutines demonstrated in each example with the click event handler of the mentioned button. Each example creates a 'Hello, World' message box after the button on the form is clicked.

Visual Basic 6:

VB.NET (MsgBox or MessageBox class can be used):

• Both Visual Basic 6 and Visual Basic .NET automatically generate the Sub and End Sub statements when the corresponding button is double-clicked in design view. Visual Basic .NET will also generate the necessary Class and End Class statements. The developer need only add the statement to display the 'Hello, World' message box.
• All procedure calls must be made with parentheses in VB.NET, whereas in Visual Basic 6 there were different conventions for functions (parentheses required) and subs (no parentheses allowed, unless called using the keyword Call).
• The names Command1 and Button1 are not obligatory. However, these are default names for a command button in Visual Basic 6 and VB.NET respectively.
• In VB.NET, the Handles keyword is used to make the sub Button1_Click a handler for the Click event of the object Button1. In Visual Basic 6, event handler subs must have a specific name consisting of the object's name ('Command1'), an underscore ('_'), and the event's name ('Click', hence 'Command1_Click').
• There is a function called MessageBox.Show in the Microsoft.VisualBasic namespace which can be used (instead of MsgBox) similarly to the corresponding function in Visual Basic 6. There is a controversy^[9] about which function to use as a best practice (not only restricted to showing message boxes but also regarding other features of the Microsoft.VisualBasic namespace). Some programmers prefer to do things 'the .NET way', since the Framework classes have more features and are less language-specific. Others argue that using language-specific features makes code more readable (for example, using int (C#) or Integer (VB.NET) instead of System.Int32).
• In Visual Basic 2008, the inclusion of ByVal sender as Object, ByVal e as EventArgs has become optional.

The following example demonstrates a difference between Visual Basic 6 and VB.NET. Both examples close the active window.

Visual Basic 6:

VB.NET:

The 'cmd' prefix is replaced by the 'btn' prefix, conforming to the new convention previously mentioned.^[which?]

Visual Basic 6 did not provide common operator shortcuts. The following are equivalent:

Visual Basic 6:

VB.NET:

Comparison with C#[edit]

C# and Visual Basic .NET are Microsoft's first languages made to program on the .NET Framework (later adding F# and more and others have also added languages). Though C# and VB.NET are syntactically different, that is where the differences mostly end. Microsoft developed both of these languages to be part of the same .NET Framework development platform. They are both developed, managed, and supported by the same language development team at Microsoft.^[10] They compile to the same intermediate language (IL), which runs against the same .NET Framework runtime libraries.^[11] Although there are some differences in the programming constructs, their differences are primarily syntactic and, assuming one avoids the Visual Basic 'Compatibility' libraries provided by Microsoft to aid conversion from Visual Basic 6, almost every command in VB has an equivalent command in C# and vice versa. Lastly, both languages reference the same Base Classes of the .NET Framework to extend their functionality. As a result, with few exceptions, a program written in either language can be run through a simple syntax converter to translate to the other. There are many open source and commercially available products for this task.

Examples[edit]

Hello World![edit]

Windows Form Application[edit]

Requires a button called Button1.

Console Application[edit]

Speaking[edit]

Windows Form Application[edit]

Requires a TextBox titled 'TextBox1' and a button called Button1.

Console Application[edit]

Version history[edit]

Succeeding the classic Visual Basic version 6.0, the first version of Visual Basic .NET debuted in 2002. As of 2017, eight versions of Visual Basic .NET are released.

2002 (VB 7.0)[edit]

The first version, Visual Basic .NET, relies on .NET Framework 1.0. The most important feature is managed code, which contrasts with the classic Visual Basic.

2003 (VB 7.1)[edit]

Visual Basic .NET 2003 was released with .NET Framework 1.1. New features included support for the .NET Compact Framework and a better VB upgrade wizard. Improvements were also made to the performance and reliability of .NET IDE (particularly the background compiler) and runtime. In addition, Visual Basic .NET 2003 was available in the Visual Studio.NET Academic Edition, distributed to a certain number of scholars^{[weasel words]} from each country without cost.

2005 (VB 8.0)[edit]

After Visual Basic .NET 2003, Microsoft dropped '.NET' from the name of the product, calling the next version Visual Basic 2005.

For this release, Microsoft added many features intended to reinforce Visual Basic .NET's focus as a rapid application development platform and further differentiate it from C#., including:

• Edit and Continue feature^{[further explanation needed]}
• Design-time expression evaluation^{[further explanation needed]}
• A pseudo-namespace called 'My', which provides:^[12][13]
  • Easy access to certain areas of the .NET Framework that otherwise require significant code to access like using My.Form2.Text=' MainForm ' rather than System.WindowsApplication1.Forms.Form2.text=' MainForm '
  • Dynamically generated classes (e.g. My.Forms)
• Improved VB-to-VB.NET converter^[14]
• A 'using' keyword, simplifying the use of objects that require the Dispose pattern to free resources
• Just My Code feature, which hides (steps over) boilerplate code written by the Visual Studio .NET IDE and system library code during debugging
• Data Source binding, easing database client/server development

To bridge the gaps between itself and other .NET languages, this version added:

• Generics^[15]
• Partial classes, a method of defining some parts of a class in one file and then adding more definitions later; particularly useful for integrating user code with auto-generated code
• Operator overloading and nullable types^[16]
• Support for unsigned integer data types commonly used in other languages

Visual Basic 2005 introduced the IsNot operator that makes 'If X IsNot Y' equivalent to 'If Not X Is Y'. It gained notoriety^[17] when it was found to be the subject of a Microsoft patent application.^[18][19]

2008 (VB 9.0)[edit]

Visual Basic 9.0 was released along with .NET Framework 3.5 on November 19, 2007.

For this release, Microsoft added many features, including:

• A true conditional operator, 'If(condition as boolean, truepart, falsepart)', to replace the 'IIf' function.
• Support for LINQ

2010 (VB 10.0)[edit]

In April 2010, Microsoft released Visual Basic 2010. Microsoft had planned to use Dynamic Language Runtime (DLR) for that release^[20] but shifted to a co-evolution strategy between Visual Basic and sister language C# to bring both languages into closer parity with one another. Visual Basic's innate ability to interact dynamically with CLR and COM objects has been enhanced to work with dynamic languages built on the DLR such as IronPython and IronRuby.^[21] The Visual Basic compiler was improved to infer line continuation in a set of common contexts, in many cases removing the need for the ' _' line continuation characters. Also, existing support of inline Functions was complemented with support for inline Subs as well as multi-line versions of both Sub and Function lambdas.^[22]

2012 (VB 11.0)[edit]

Visual Basic 2012 was released along .NET Framework 4.5. Major features introduced in this version include:^{[further explanation needed]}

• Asynchronous programming with 'async' and 'await' statements
• Iterators
• Call hierarchy
• Caller information
• 'Global' keyword in 'namespace' statements

2015 (VB 14.0)[edit]

Visual Basic 2015 (code named VB '14.0') has been released with Visual Studio 2015.Language features include a new '?.' operator to perform inline null checks, and a new string interpolation feature is included to format strings inline.^[23]

2017 (VB 15.0)[edit]

Visual Basic 2017 (code named VB '15.0') has been released with Visual Studio 2017.Extends support for new Visual Basic 15 language features, and introduces new refactorings that allow organizing source code with one action.^[24]

2019 (VB 16.0)[edit]

Visual Basic 2019 (code named VB '16.0') has been released with Visual Studio 2019.^[25]

Cross-platform and open-source development[edit]

The official VB.NET compiler is written in VB.NET and is available on GitHub as a part of the .NET Compiler platform.^[26] The creation of open-source tools for VB.NET development has been slow compared to C#, although the Mono development platform provides an implementation of VB.NET-specific libraries and a VB.NET 8.0 compatible compiler written in VB.NET,^[27] as well as standard framework libraries such as Windows Forms GUI library.

SharpDevelop and MonoDevelop are open-source alternative IDEs.

See also[edit]

References[edit]

1. ^ ^ab'Option Explicit and Option Strict in Visual Basic .NET and in Visual Basic'. Support. Microsoft. March 19, 2008. Retrieved August 22, 2013.
2. ^Dollard, Kathleen. 'Visual Basic in .NET Core 3.0'. blogs.msdn.microsoft.com.
3. ^https://github.com/dotnet/roslyn/blob/1ff27b046b5c03abb38bfeda44eb82da0b8df9de/License.txt
4. ^'New Features in Visual Basic 10'.
5. ^'Module Statement'. MSDN – Developer Center. Retrieved January 20, 2010.
6. ^'Main Procedure in Visual Basic'. MSDN – Developer Center. Retrieved January 20, 2010.
7. ^'Visual Basic Version of Hello, World'. MSDN – Developer Center. Retrieved January 20, 2010.
8. ^'Microsoft Visual Basic 6.0 Migration Resource Center'. MSDN. Microsoft. Retrieved November 9, 2014.
9. ^'Visual Studio 2003 Retired Technical documentation'. Microsoft Download Center.
10. ^Krill, Paul (February 27, 2009). 'Microsoft converging programming languages | Developer World'. InfoWorld. Archived from the original on January 26, 2013. Retrieved August 18, 2013.Cite uses deprecated parameter |dead-url= (help)
11. ^'Microsoft Intermediate Language'. Dotnet-guide.com. Retrieved August 18, 2013.
12. ^Mackenzie, Duncan (2006). 'Navigate The .NET Framework And Your Projects With The My Namespace'. MSDN Magazine Visual Studio 2005 Guided Tour 2006. Microsoft.
13. ^Whitney, Tyler (November 2005). 'My.Internals: Examining the Visual Basic My Feature'. MSDN. Microsoft.
14. ^'What's New with the Visual Basic Upgrade Wizard in Visual Basic 2005'. msdn2.microsoft.com.
15. ^'Defining and Using Generics in Visual Basic 2005'. msdn2.microsoft.com.
16. ^'Operator Overloading in Visual Basic 2005'. msdn2.microsoft.com.
17. ^Sherriff, Lucy (February 22, 2005). 'Real Software slams MS IsNot patent application'. The Register. Retrieved April 6, 2009.
18. ^Taft, Darryl K. (February 21, 2005). 'Real Software Slams Microsofts Patent Effort'. eWeek. Retrieved April 6, 2009.
19. ^Vick, Paul A. Jr.; Barsan, Costica Corneliu; Silver, Amanda K. (May 14, 2003). 'United States Patent Application: 20040230959'. Patent Application Full Text and Image Database. US Patent & Trademark Office. Retrieved April 6, 2009.
20. ^'What the heck is 'VBx'?'. May 1, 2007. Retrieved August 12, 2009. With the new DLR, we have support for IronPython, IronRuby, Javascript, and the new dynamic VBx compile
21. ^'What is New in Visual Basic 2010'. Microsoft. 2009. Retrieved August 12, 2009. Visual Basic binds to objects from dynamic languages such as IronPython and IronRuby
22. ^'What's New in Visual Basic 2010'. Microsoft. 2010. Retrieved August 1, 2010.
23. ^'New Language Features in Visual Basic 14'. msdn.com.
24. ^reshmim. 'Visual Studio 2017 Release Notes'. www.visualstudio.com.
25. ^reshmim. 'Visual Studio 2019 Release Notes'. www.visualstudio.com.
26. ^Roslyn, .NET Foundation, April 13, 2019, retrieved April 14, 2019
27. ^'Redirecting…'. www.mono-project.com.

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Further reading[edit]

1. 'Visual Basic Language Specification 8.0'. Microsoft Corporation. November 15, 2005. Retrieved December 10, 2010.
2. 'Visual Basic Language Specification 9.0'. Microsoft Corporation. December 19, 2007. Retrieved September 28, 2011.
3. 'Visual Basic Language Specification 11.0'. Microsoft Corporation. June 7, 2013. Retrieved September 22, 2013.

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