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NET" from the name of the product, calling the next version Visual Basic 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. It gained notoriety  when it was found to be the subject of a Microsoft patent application.
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NET Framework 3. In April , Microsoft released Visual Basic Microsoft had planned to use Dynamic Language Runtime DLR for that release  but shifted to a co-evolution strategy between Visual Basic and sister language C to bring both languages into closer parity with one another. 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.
Visual Basic was released along. NET Framework 4. Major features introduced in this version include: Visual Basic code named VB " Language features include a new "?.
Extends support for new Visual Basic 15 language features, and introduces new refactorings that allow organizing source code with one action. The official VB. NET compiler is written in VB. NET and is available on GitHub as a part of the.
NET Compiler platform. 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. From Wikipedia, the free encyclopedia. This section needs expansion. You can help by adding to it. April WriteLine "Hello, World! Module Module1. Sub Main. WriteLine "Hello, world! Imports System. Do Until Integer. TryParse ReadLine "Enter a value for how many rows to be displayed: ReadLine with a version which takes a prompt string.
Main article: Comparison of Visual Basic and Visual Basic. Click Close End Sub. Height - 1 End Sub. Tick Me. Comparison of C Sharp and Visual Basic. Information , "Hello world! End Sub End Class. Module Module1 Sub Main Console. WriteLine "Hello world! ReadKey ' The user must press any key before the application ends.
End Sub End Module. Click CreateObject "Sapi. Speak TextBox1. Text End Sub End Class. Write "Enter the text to speak: ReadLine ' The user must enter the text to speak. Speak Text ' Speak the text the user has entered. NET and in Visual Basic". March 19, Retrieved August 22, NET Core 3. Retrieved January 20, Retrieved November 9, Microsoft Download Center.
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Read 28 www. Instance members and shared members When you create an object from a class, the result is an instance of that class. Members that are not declared with the Shared keyword are instance members, which belong strictly to that particular instance. An instance member in one instance is independent of the same member in another instance of the same class.
An instance member variable, for example, can have different values in different instances. Members declared with the Shared keyword are shared members, which belong to the class as a whole and not to any particular instance. A shared member exists only once, no matter how many instances of its class you create, or even if you create no instances.
A shared member variable, for example, has only one value, which is available to all code that can access the class. Accessing nonshared members To access a nonshared member of an object Make sure the object has been created from its class and assigned to an object variable.
Dim secondForm As New System. Form In the statement that accesses the member, follow the object variable name with the member-access operator. Show Accessing shared members To access a shared member of an object Follow the class name with the member-access operator. You should always access a Shared member of the object directly through the class name. MachineName If you have already created an object from the class, you can alternatively access a Shared member through the object's variable.
Differences between classes and modules The main difference between classes and modules is that classes can be instantiated as objects while standard modules cannot.
Because there is only one copy of a standard module's data, when one part of your program changes a public variable in a standard module, any other part of the program gets the same value if it then reads that variable.
In contrast, object data exists separately for each instantiated object. Another difference is that unlike standard modules, classes can implement interfaces. Note When the Shared modifier is applied to a class member, it is associated with the class itself instead of a particular instance of the class. The member is accessed directly by using the class name, the same way module members are accessed.
Classes and modules also use different scopes for their members. Members defined within a class are scoped within a specific instance of the class and exist only for the lifetime of the object. To access class members from outside a class, you must use fully qualified names in the format of Object. On the other hand, members declared within a module are publicly accessible by default, and can be accessed by any code that can access the module.
This means that variables in a standard module are effectively global variables because they are visible from anywhere in your project, and they exist for the life of the program. Reusing classes and objects Objects let you declare variables and procedures once and then reuse them whenever needed. For example, if you want to add a spelling checker to an application you could define all the variables and support functions to provide spell-checking functionality.
If you create your spelling checker as a class, you can then reuse it in other applications by adding a reference to the compiled assembly. Better yet, you may be able to save yourself some work by using a spelling checker class that someone else has already developed.
NET Framework provides many examples of components that are available for use. The following example uses the TimeZone class in the System namespace. TimeZone provides members that allow you to retrieve information about the time zone of the current computer system.
GetUtcOffset Now. Relationships among objects Objects can be related to each other in several ways.
The principal kinds of relationship are hierarchical and containment. Hierarchical relationship When classes are derived from more fundamental classes, they are said to have a hierarchical relationship.
Class hierarchies are useful when describing items that are a subtype of a more general class. In the following example, suppose you want to define a special kind of Button that acts like a normal Button but also exposes a method that reverses the foreground and background colors. To define a class is derived from an already existing class Use a Class Statement to define a class from which to create the object you need.
Public Class reversibleButton Be sure an End Class statement follows the last line of code in your class. By default, the integrated development environment IDE automatically generates an End Class when you enter a Class statement. Follow the Class statement immediately with an Inherits Statement.
Specify the class from which your new class derives. Inherits System. Button Your new class inherits all the members defined by the base class.