|Usual file extensions||.vb|
|Paradigm||structured, imperative, object-oriented, declarative|
|Appeared in||2001 (last revised 2008)|
|Stable release||Visual Basic 2008 (VB 9.0) (November 19, 2007)|
|Typing discipline||dynamic, strong, both safe and unsafe, nominative|
|Major implementations||.NET Framework, Mono|
|Dialects||Microsoft Visual Studio .NET, .NET 2003, 2005, 2008,2010(Beta)|
|Website||Microsoft's VB.NET website|
Visual Basic .NET (VB.NET) is an object-oriented computer programming language that can be viewed as an evolution of Microsoft's Visual Basic (VB) which is generally implemented on the Microsoft .NET Framework. Microsoft currently supplies Visual Basic Express Edition free of charge.
As of November 2007, there are four versions of Visual Basic .NET that were implemented by The Visual Basic Team
The original Visual Basic .NET was released alongside Visual C# and ASP.NET in 2002. Significant changes broke backward compatibility with older versions and caused a rift within the developer community.
Visual Basic .NET 2003 was released with version 1.1 of the .NET Framework. 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 the .NET IDE (particularly the background compiler) and runtime. In addition, Visual Basic .NET 2003 was available in the Visual Studio .NET 2003 Academic Edition (VS03AE). VS03AE is distributed to a certain number of scholars from each country without cost.
Visual Basic 2005 is the name used to refer to the update to Visual Basic .NET, Microsoft having decided to drop the .NET portion of the title.
For this release, Microsoft added many features, including:
Visual Basic 2005 introduced features meant to fill in the gaps between itself and other "more powerful" .NET languages, adding:
One other feature of Visual Basic 2005 is the
IsNot operator that makes
'If X IsNot Y' equivalent to
'If Not X Is Y', which gained notoriety when it was found to be the subject of a Microsoft patent application.
Part of the Visual Studio product range, Microsoft created a set of free development environments for hobbyists and novices, the Visual Studio 2005 Express series. One edition in the series is Visual Basic 2005 Express Edition, which was succeeded by Visual Basic 2008 Express Edition in the 2008 edition of Visual Studio Express.
The Express Editions are targeted specifically for people learning a language. They have a streamlined version of the user interface, and lack more advanced features of the standard versions. On the other hand, Visual Basic 2005 Express Edition does contain the Visual Basic 6.0 converter, so it is a way to evaluate feasibility of conversion from older versions of Visual Basic.
Visual Basic 9.0 was released together with the Microsoft .NET Framework 3.5 on November 19, 2007.
For this release, Microsoft added many features, including:
In 2007, Microsoft planned to use the Dynamic Language Runtime (DLR) for the upcoming Visual Basic 10, also known as VBx. However, as of August 2009, no further mention of VBx working on the DLR has been made by Microsoft on development updates. Similar to C#, Visual Basic will be able to access objects from dynamic languages built on the DLR such as IronPython and IronRuby
Whether Visual Basic .NET should be considered as just another version of Visual Basic or a completely different language is a topic of debate. This is not obvious, as once the methods that have been moved around and that can be automatically converted are accounted for, the basic syntax of the language has not seen many "breaking" changes, just additions to support new features like structured exception handling and short-circuited expressions. Two important data type changes occurred with the move to VB.NET. Compared to VB6, the
Integer data type has been doubled in length from 16 bits to 32 bits, and the
Long data type has been doubled in length from 32 bits to 64 bits. This is true for all versions of VB.NET. A 16-bit integer in all versions of VB.NET is now known as a
Short. Similarly, the Windows Forms GUI editor is very similar in style and function to the Visual Basic form editor.
The version numbers used for the new Visual Basic (7, 7.1, 8, 9, ...) clearly imply that it is viewed by Microsoft as still essentially the same product as the old Visual Basic.
The things that have changed significantly are the semantics—from those of an object-based programming language running on a deterministic, reference-counted engine based on COM to a fully object-oriented language backed by the .NET Framework, which consists of a combination of the Common Language Runtime (a virtual machine using generational garbage collection and a just-in-time compilation engine) and a far larger class library. The increased breadth of the latter is also a problem that VB developers have to deal with when coming to the language, although this is somewhat addressed by the My feature in Visual Studio 2005.
The changes have altered many underlying assumptions about the "right" 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 VB6 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.
The following simple example demonstrates similarity in syntax between VB and VB.NET. Both examples pop up a message box saying "Hello, World" with an OK button.
Classic VB example:
Private Sub Command1_Click() MsgBox "Hello, World" End Sub
A VB.NET example, MsgBox or the MessageBox class can be used:
Public Class Form1 Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click MsgBox("Hello, World") End Sub End Class
Public Class Form1 Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click MessageBox.Show("Hello, World") End Sub End Class
End Substatements when the corresponding button is clicked in design view. Visual Basic .NET will also generate the necessary
End Classstatements. The developer need only add the statement to display the "Hello, World" message box.
Button1are not obligatory. However, these are default names for a command button in VB6 and VB.NET respectively.
Handleskeyword is used to make the sub
Button1_Clicka handler for the
Clickevent of the object
Button1. In VB6, 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").
Microsoft.VisualBasicnamespace which can be used similarly to the corresponding function in VB6. There is a controversy about which function to use as a best practice (not only restricted to showing message boxes but also regarding other features of the
Microsoft.VisualBasicnamespace). 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
Integer(VB.NET) instead of
The following example demonstrates a difference between VB6 and VB.NET. Both examples close the active window.
Classic VB Example:
Sub cmdClose_Click() Unload Me End Sub
A VB.NET example:
Sub btnClose_Click(ByVal sender As Object, ByVal e As EventArgs) Handles btnClose.Click Me.Close() End Sub
Note the 'cmd' prefix being replaced with the 'btn' prefix, conforming to the new convention previously mentioned.
Visual Basic 6 did not provide common operator shortcuts. The following are equivalent:
Sub Timer1_Timer() Me.Height = Me.Height - 1 End Sub
Sub Timer1_Tick(ByVal sender As Object, ByVal e As EventArgs) Handles Timer1.Tick Me.Height -= 1 End Sub
Long-time Visual Basic users have complained  about Visual Basic .NET because initial versions dropped a large number of language constructs and user interface features  that were available in VB6 (which is no longer sold by Microsoft now), and changed the semantics of those that remained; for example, in VB.NET parameters are (by default) passed by value, not by reference. Detractors refer pejoratively to VB.NET as Visual Fred or DOTNOT. On March 8, 2005, a petition  was set up in response to Microsoft's refusal to extend its mainstream support for VB6.
VB.NET's supporters state that the new language is in most respects more powerful than the original, incorporating modern object oriented programming paradigms in a more natural, coherent and complete manner than was possible with earlier versions. Opponents tend to respond that although VB6 has flaws in its object model, the cost in terms of redevelopment effort is too high for any benefits that might be gained by converting to VB.NET.
It is simpler to decompile languages that target Common Intermediate Language (CIL), including VB.NET, compared to languages that compile to machine code. Tools such as .NET Reflector can provide a close approximation to the original code due to the large amount of metadata provided in CIL.
Microsoft supplies an automated VB6-to-VB.NET converter with Visual Studio .NET, which has improved over time, but it cannot convert all code, and almost all non-trivial programs will need some manual effort to compile. Most will need a significant level of code refactoring to work optimally. Visual Basic programs that are mainly algorithmic in nature can be migrated with few difficulties; those that rely heavily on such features as database support, graphics, unmanaged operations or on implementation details are more troublesome.
In addition, the required runtime libraries for VB6 programs are provided with Windows 98 SE and above, while VB.NET programs require the installation of the significantly larger .NET Framework. The framework is included with Windows 7, Windows Vista, Windows XP Media Center Edition, Windows XP Tablet PC Edition, Windows Server 2008 and Windows Server 2003. For other supported operating systems such as Windows 2000 or Windows XP (Home or Professional Editions), it must be separately installed.
Microsoft's response to developer dissatisfaction has focused around making it easier to move new development and shift existing codebases from VB6 to VB.NET. Their latest offering is the VBRun website, which offers code samples and articles for:
The creation of open-source tools for VB.NET development have 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, as well as standard framework libraries such as Windows Forms GUI library.
The following is a very simple VB.NET program, a version of the classic "Hello world" example created as a console application:
Module Module1 Sub Main() Console.WriteLine("Hello, world!") End Sub End Module
The effect is to write the text Hello, world! to the command line. Each line serves a specific purpose, as follows:
This is a module definition, a division of code similar to a class, although modules can contain classes. Modules serve as containers of code that can be referenced from other parts of a program.
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.
This is the entry point where the program begins execution. Sub is an abbreviation of "subroutine."
This line performs the actual task of writing the output. Console is a system object, representing a command-line 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. Another common method is using MsgBox (a Message Box).
Option Strictcan be used to switch between safe and unsafe type checking.
Visual Basic .NET is a multi-purpose computer programming language from Microsoft that is suitable for most development needs. The language is designed with Rapid Application Development in mind, providing several tools to shorten development time. This WikiBook introduces Visual Basic.NET language fundamentals and covers a variety of the base class libraries (BCL) provided by the .NET Framework.
Hello, this is the graphics section, please add information to me.xx
GDI+ is a way to draw simple graphics and strings on a Form.
Manipulating MS Office documents and even MS Office itself from VB.NET
Visual Basic .NET is the second series of Microsoft's Visual Basic series. It is sometimes shortened to VB.NET. It is an IDE (Integrated Development Environment) and it includes an easy 'drag-and-drop' interface. It can make complete programs for Windows very easily.
It was first released in 1991 by Microsoft. Visual Basic is a simple way to make programs for Windows. It started as Project Ruby by Alan Cooper and then was sold to Microsoft. The system is built loosely on the original BASIC programming language released in 1963 and it can 'Test' programs in real-time, error checking them in a user-friendly way.
This package is the 'backbone' of Visual Basic .NET. When applications are created, the Windows Installer includes the framework with it. It includes all the items needed to run the VB.NET applications that have been made.
|Name||Operating System||Date Released|
|Visual Basic .NET||Windows||2002|
|Visual Basic .NET 2003||Windows||2003|
|Visual Basic 2005||Windows||2005|
|Visual Basic 2005 Studio||Windows||2005|
|Visual Basic 2008 Studio||Windows||2008|
|Visual Basic 2010 Studio||Windows||2010|
This is a free version of Visual Basic 2010 released officially from Microsoft. It is aimed at encouraging more newbie programmers to try the series. The program can be downloaded from Microsoft's Website.
Visual Basic .NET uses many controls which can be added to the forms or windows in the application. Other developers can create controls for applications, not just the ones that Microsoft include.
The following example makes a program window pop up that says "Hello World" and has a button that says "OK" used to close the window:
button1.Click MsgBox("Hello World")