visual basic

In brief, Visual Basic automatically converts a value of a given type to any other type to which it widens.

The Continue keyword in Visual Basic now allows you to skip to the next iteration of a loop without processing the rest of the loop body.

Visual Basic allows implicit conversions of any data type to any other data type.

Although Visual Basic Express Edition makes programming easy, it may not always behave exactly as you expect.

Build events in Visual Basic can be used to run scripts, macros, or other actions as a part of the compilation process.

Optional. Denotes the beginning of the name of the attribute when attribute is not a valid identifier in Visual Basic.

The Visual Basic Date function, used to set the system date for your computer, will not accept Hijri dates.

While ASP. NET code is all on the server, there may also be JavaScript or Visual Basic code on the client.

As you work in Visual Basic Express Edition, help is always just a key-press away.

When sorting, a null reference (Nothing in Visual Basic) is considered to be less than any other object.

Visual Basic allows you to test conditions and perform different operations depending on the results of that test.

Visual Basic includes a code library of IntelliSense Code Snippets that you can insert with a few mouse clicks into your application.

Nevertheless, both the Visual Basic and C# compilers allow you to touch static members of a base type through a derived type name.

Converts to a string terminating in a null reference (Nothing in Visual Basic) or to a BSTR.

If you do not use New, the initial value of the variable is Nothing (Visual Basic).

Visual Basic does not support the Exit Statement (Visual Basic) to transfer control out of a With block.

If you are completely new to development, this page provides the learning materials necessary for you to begin developing with Visual Basic.

Make sure you did not attempt to change a Visual Basic project within a database or document.

Visual Basic now allows you to have greater control over the detailed behavior of events.

Include the Option Explicit Statement (Visual Basic) at the beginning of your code.

That information will help Microsoft engineers identify the cause of the error and may help improve the next release of Visual Basic.

Demonstrates how to use Visual Basic functions to determine information about a file, search for a string in a file, and write to a file.

Control structures in Visual Basic can be nested to as many levels as you want.

The simplified program is called WordXml. Net, and I'll document the Visual Basic. NET source code in sections below.

The database tools in Visual Basic make working with data a snap, as you will see in the next few lessons.

The designer architecture in Visual Studio lets you assemble non-visual component classes as easily as you assemble Visual Basic forms.

You can go on to the next topic for some suggestions on other resources for learning more about Visual Basic.

If you programmed previously in Visual Basic 6, you know that the following code could be used to show one of the forms in your project.

You are not yet a Visual Basic expert, but you know enough to start writing your own programs.

Describes how Visual Basic supports inheritance, allowing you to define classes that serve as the basis for derived classes.

Visual Basic allows you to pass objects as arguments to procedures in the same way that you pass other types of arguments.

Specifies that Visual Basic should marshal all strings to Unicode values regardless of the name of the external procedure being declared.

Shows the general outline of a simple Visual Basic program.

If any of these members is nullNothingnullptra null reference (Nothing in Visual Basic), its value is not included in the returned string.

The name of the protected virtual (Overridable in Visual Basic) method should be the same as the event name prefixed with On.

Visual Basic also provides a Collection class, with which you can define and create your own collections.

When you finish, you will be familiar with Visual Basic tools and conceptsand ready to start writing your own programs.

Traditionally, polymorphism in Visual Basic was accomplished with interfaces, and interfaces can still be used for this purpose.

In Visual Basic 2005, it is now up to the printer to expose this as an advanced option.

For more product information or to download Visual Basic 2005 Express Edition, you can visit the Express product pages.

That information will help Microsoft engineers identify the cause and may help improve the next release of Visual Basic.

If it were a Visual Basic project, the path would start with [VB].

Visual Basic updates the integer data types for interoperability with other programming languages and with the common language runtime.

If the reference is not unique, Visual Basic produces an error stating that the name is ambiguous.

The Visual Basic 2005 Timer is a component that is added to the tray at design time; as a component it has no Parent property.

Despite the term including the word "event, " synchronization events are unlike other Visual Basic eventsthey are really wait handles.

Visual Basic lets you test conditions and perform different operations depending on the results of that test.

Cannot be used to create instances of classes in Visual Basic unless those classes are explicitly exposed as COM components.

In such a case, when the procedure returns, Visual Basic must then copy the local variable value back into the argument in the calling code.

The UserAddress class is a simple example of the kind of data types you can create in Visual Basic. NET.

Do not define public or protected internal (Protected Friend in Visual Basic) constructors in abstract types.

Because properties have been available in several editions of Visual Basic, Visual Basic programmers might wish to skip this topic.

Document property returns a string containing the name of an HTML document; in Visual Basic 2005, it returns the HTML document itself.

The framework unifies these disparate models and gives Visual Basic and JScript programmers access to class libraries as well.

The Code Advisor for Visual Basic 6 is an add-in used to review your code to ensure that it meets predetermined coding standards.

Do not pass null (Nothing in Visual Basic) as the sender parameter when raising a non-static event.

Expressions, which are always written in Microsoft Visual Basic, are used to aggregate data or perform conditional formatting.

This procedure has provided VB and the USB correspondence, may let you understand VB and controls the means of communication, Visual Basic.

Most authoring tools are a bit like Visual Basic, only they work at a much higher level.

The Visual Basic Code Editor can also help you to find and fix compiler errors before you even try to run the program.

In Visual Basic 6. 0, the Overlay method of an ImageList control allows you to create a composite third image out of two ListImage objects.

Visual Basic and the. NET Framework do not currently support any combination of external references and generic types.

To refer to a collection from an expression, you can use standard Visual Basic syntax for an item in a collection.

Error messages can occur while an application is running, either within the Visual Basic environment or as a stand-alone executable file.

Interface method for base classes is missing when you populate a combo box in a sequence diagram of a Microsoft Visual Basic.

Developers already familiar with Visual Basic will be able to port existing applications or create new ones very quickly.

In earlier versions of the . NET Framework, all Visual Basic applications automatically had a runtime dependency added.

This document will walk you through the creation of your first Windows CE application written in Microsoft Visual Basic.

You can use the Visual Basic function in any language as long as you fully qualify the function call with the namespace.

The recommended approach, however, is to include the Private variable as the value in a Return Statement (Visual Basic).

Do not pass null (Nothing in Visual Basic) as the event data parameter when raising an event.

Nearly everything you do in Visual Basic involves objects, from the controls you use to the forms on which you place them.

The Visual Basic collection allows you to specify a key when you add an element to it.

To handle events in a Visual Basic project, select an event from the method name list at the top of the Code Editor.

Visual Basic also has partial methods and though VB does not require definite assignments for variables, it has the same restrictions.

The type of the parent of this method is an interface and this method is not virtual (Overridable in Visual Basic).

Used by the Visual Basic. NET Data Designers to represent a parameter to a Command object, and optionally, its mapping to DataSet columns.

This class contains utilities that the Visual Basic compiler uses; it is not meant to be called directly from your code.

The following topics present a set of programming guidelines for Visual Basic programs, along with examples of good usage.

In Visual Basic 2005, a default member of a class or structure can only be a property that takes one or more arguments.

Now, however, Visual Basic provides the option of using inheritance to provide polymorphism as well.

The Visual Basic compiler does not verify that your data types are compatible with those of the external procedure.

The Visual Basic compiler uses this class during static local initialization; it is not meant to be called directly from your code.

Fortunately the Visual Basic Code Editor was designed to identify these mistakes before you try to run the program.

When a run-time error does occur, you can use the debugging tools in Visual Basic to determine the cause.

If you add a reference to a property that is not supported for that field, the reference evaluates to null (Nothing in Visual Basic).

This topic links you to information on upgrading your applications from previous versions of Visual Basic to the current version.

In the next lesson you will learn about some of the more surprising things that you can do with Visual Basic 2005.

Visual Basic allows you to create your own namespaces to organize the classes in your applications and libraries.

This topic is designed to help you quickly find code examples for creating ASP. NET Web applications in Visual Basic. NET.

In general, the code editor for Microsoft Visual Basic 2005 provides more detailed error information as you code.

In the previous lesson, you learned that a database can be used to store and retrieve data for your Visual Basic programs.

An attempt was made to set the initialization vector to nullNothingnullptra null reference (Nothing in Visual Basic).

Visual Basic automatically calls a property's Set procedure when an assignment statement provides a value to be stored in the property.

Otherwise, Visual Basic runs the error-handling code when it reaches the end of the subroutine, causing unwanted or unexpected results.

In Visual Basic 6. 0, it is possible to assign a SelectedImage property to a TreeView control node without assigning an Image property.

Both direct Visual Basic to look it up without modifying its name during the search.

If code makes a reference to a class or structure without specifying a member, Visual Basic resolves that reference to the default property.

Visual Basic run-time errors occur when an application attempts to perform an action that the system cannot execute.

The name of the method you specify for the SelectMethod property is case-sensitive, even if you are programming in Visual Basic. NET.

For security reasons, Reporting Services does not support XSL transformations with embedded Microsoft Visual Basic code.

Namespaces may at first seem to be a new concept in Visual Basic 2005.

In general, Basic syntax is similar to Visual Basic except that it has specific extensions to handle reporting.

When the URL value for an image is nullNothingnullptra null reference (Nothing in Visual Basic), an image cannot be displayed.

Instances of the Visual Basic Collection class allow you to access an item using either a numeric index or a String key.

This material is presented at the beginning of an article comparing Visual Basic 6. 0 And Visual Basic. NET objects.

By default, the Visual Basic compiler enforces explicit declaration, which requires that you declare every variable before you use it.

Visual Basic Express Edition provides Starter Kits to help you start writing programs right away.

This class supports the Visual Basic compiler and is not intended to be used directly from your code.

Returns a Boolean value indicating whether a Visual Basic Collection object contains an element with a specific key.

Allows you to specify compilation properties for Visual Basic projects.

In Visual Basic 2005, forms are entirely Unicode-enabled; conversion between code pages is no longer required.

Select the Windows Control Library project template from the list of Visual Basic projects, and type ValueButtonLib in the Name box.

In Visual Basic 2005, the application ends when the startup form is closed, regardless of any non-MDI forms in the application.

One of the most common complaints about Visual Basic is its dependence on a runtime library.

The name card executive program, uses for everybody study research, Visual Basic.

The Visual Basic compiler uses this class for object flow control; it is not meant to be called directly from your code.

Mentions classes in the System. Net namespace that replace Internet controls in earlier versions of Visual Basic.

This page links to help on widely used Visual Basic tasks for creating Windows-based applications.

The Visual Basic Guided Tour is a series of sequential lessons that will introduce you to the basics of programming in Visual Basic 2005.

If the method does not require any parameters, values should be nullNothingnullptra null reference (Nothing in Visual Basic).

The Visual Basic compiler generates error information for links that cannot be resolved.

If the Visual Basic compiler comes across code that it does not understand, it issues a compiler error.

If the variable is a reference type, you can create an instance of its class by including the New (Visual Basic) keyword in the As clause.

When you define certain operators, Visual Basic requires that you also define the operator for the inverse operation.

This allows you to upgrade portions of a project or application while leaving others in Visual Basic 6. 0.

This page links to help on widely used Visual Basic tasks for creating Web Service applications.

However, the Visual Basic compiler automatically generates a Main procedure in such an application, and you do not need to write one.

As you learned in an earlier lesson, Visual Basic programs are built with objects such as forms and controls.

Attributes are keyword-like tags in which you can specify additional information about entities defined in Visual Basic applications.

By the time of Visual Basic 6. 0, this was largely unnecessary, but the property was maintained for backward compatibility.

You can share it easily with friends and coworkers, or other members of the Visual Basic community.

This page links to help on widely used Visual Basic tasks for creating Windows applications.

Collection has no direct equivalent in Visual Basic 2005.

The Visual Basic Editor is a program designed to make writing and editing macro code easy for beginners, and provides plenty of online Help.

In Visual Basic 2005, project and solution files are in an XML format; they should not be edited directly.

As you learned in an earlier lesson, Visual Basic programs are built with objects such as forms or controls.

For information about configuring Visual Basic projects for manifest generation, see Application Page, Project Designer (Visual Basic).

As another example, you can use the Execute Process task to run a custom Visual Basic application that generates a daily sales report.

Getting Started with Visual Basic This section of the documentation helps you get started with Visual Basic application development.

For Visual Basic projects, changing the build output directory is done through the Compile Pane of the Project Designer.

Describes settings for end constructs, code reformatting, outlining, and error correction suggestions, among others, for Visual Basic code.

Gets the type that declares the method, which is always nullNothingnullptra null reference (Nothing in Visual Basic) for dynamic methods.

Although you can create your own delegates, in most cases Visual Basic creates the delegate and takes care of the details for you.

Contains types that support the My logging objects in Visual Basic and provides a simple log listener that directs logging output to file.

This page links to Help on widely used Visual Basic building, debugging and testing tasks.

Discusses how. NET Framework attributes provide additional information about entities defined inside a Visual Basic application.

As with any modern programming language, Visual Basic supports a number of common programming constructs and language elements.

The name must be a valid Visual Basic 2005 qualifier.

It uses the Visual Basic language and is used for creating, editing, and debugging macros.

Directive enables you to collapse and hide sections of code in Visual Basic files.

Select the Class Library project template from the list of Visual Basic project types, and enter CDemoLib in the Name box.

Programming elements in Visual Basic include statements, declarations, methods, operators, and keywords.

You can also use the TypeOf Operator (Visual Basic) to determine whether an object variable currently refers to a specific data type.

An escaped name can match any Visual Basic keyword, since the brackets remove any ambiguity.

Also specifies how Visual Basic should look up the external procedure within its external file.

This section includes links to resources to help you connect your Visual Basic 2005 code to the unmanaged component(s) that you need to use.

To split a class definition in Visual Basic, use the Partial keyword, as shown in the following example.

This page links to help on widely used Visual Basic tasks for smart device applications.

This page links to help on widely used Visual Basic tasks for creating Web applications.

Summarizes interesting code samples contained in the topics in each section of the Visual Basic conceptual documentation.

Is a keyword used by Visual Basic to indicate that an object variable does not contain a reference to an object.

In Visual Basic 2005, pixels are the standard unit of measurement; there is no longer any need for conversion.

It cannot take an operand that is not a reference type unless the other operand is Nothing (Visual Basic).

The main research contents of this design makes use of the Visual Basic and the access database to develop a guest room management system.

Passes a null reference (Nothing in Visual Basic) instead of a reference to a value type.

On the first entry into the code element declaring the variable, Visual Basic initializes it to the default value for its data type.

CLR user-defined functions are simply static methods (shared functions in Visual Basic) defined within a . NET assembly.

The reference in the Visual Basic application points to the interop assembly, not the actual COM object.

Visual Basic programmers have seen several data access technologies over the years, including DAO, RDO, and ADO.

This section covers some of the issues associated with creating and using COM objects with Visual Basic.

When you declare a programming element in a module, Visual Basic promotes its scope to the namespace containing the module.

The script is not compiled, so it is not necessary to have an installation of Visual Basic.

Visual Basic lets you dynamically associate event handlers with events by creating a delegate for you when you use the.

In Visual Basic if it does not want a method invoked when the operation completes.

This format is only available for macro sheets (not Visual Basic modules).

A project in Visual Basic is a place to store the pieces of your program and keep those pieces organized.

For a variable, Visual Basic initializes it to the default value for its data type.

Gets a value that indicates whether the Visual Basic for Applications project for the workbook has been digitally signed.

If omitted, the Visual Basic Help-file context ID for the error corresponding to the Number property is used, if it exists.

Visual Basic sometimes rearranges arithmetic expressions to increase internal efficiency.

Visual Basic Projects These application templates provide the basic file references and forms for the specified language.

Because these methods were originally written to be used by Visual Basic, by default Visual Basic passes parameters by reference.

The essential categories of what you can do with Visual Basic are listed in this topic.

However, Visual Basic does not support operations or type conversions involving types it does not supply.

All Microsoft Visual Basic 2005 Express Edition starter kits include tutorials to help you customize the kit.

Transfers control to a target instruction if value is false, a null reference (Nothing in Visual Basic), or zero.

One of the elements in types is nullNothingnullptra null reference (Nothing in Visual Basic).

Macro projects created in Microsoft Visual Basic for Applications can be included in add-ins and in most Microsoft Office programs.

This is the visual part of Visual Basic, where you design the appearance of your application.

This section will highlight the dialog boxes in Visual Studio. NET that contain information used by COM and by the Visual Basic. NET EXE.

If the object reference is null (Nothing in Visual Basic), the object is marshaled to a variant of type VT_EMPTY.

In the Project Explorer window, select the database or Visual Basic for Applications (VBA) project that you want to sign.

The Get Statement and Set Statement (Visual Basic) allow only an access modifier (Public, Protected, Friend, Protected Friend, Private).

The Imports property contains a collection of all the project-level Imports statements in a Visual Basic project.

Explains the interoperability issues associated with creating and using component object model (COM) objects with Visual Basic.

Excel 2007 also does not change defined names that are referenced through Microsoft Visual Basic for Applications (VBA) code.

In Visual Basic 2005, there is no equivalent for the Shape control and lightweight controls are no longer supported.

A Main method that invokes the static (shared in Visual Basic) Run method and passes a Form instance to it.

Module members default to Public (Visual Basic) access, except variables and constants, which default to Private (Visual Basic) access.

For Visual Basic projects, enables you to view the code in the Settings. Vb file.

Previous versions of Visual Basic recognize two types of modules: class modules (. Cls files) and standard modules (. Bas files).

Property contains the name of the Visual Basic Help file.

The topics in this section document the Visual Basic run-time objects and contain tables of their member procedures, properties, and events.

The Visual Basic Collection class is one-based for the purpose of compatibility with previous versions.

You can use a Connection Parameters control and specify connection parameters in a Visual Basic property sheet.

When referencing a specific form, this property works just as it did in Visual Basic 6. 0.

To solve this problem, Visual Basic interprets two quotation marks in a string literal as one quotation mark in the string.

In Visual Basic 6. 0, an MDIForm was a special type of form that acted as a container for an MDI (Multiple Document Interface) application.

Visual Basic provides a well-defined model for controlling the behavior of Windows Forms applications: the Visual Basic Application model.

Class members default to Public (Visual Basic) access, except variables and constants, which default to Private (Visual Basic) access.

Doc- Books management system management system demand specification instructions doc, Visual Basic.

Other file types may be corrupted by the addition of square brackets around Visual Basic keywords.

In contrast with expressions, custom code can be written in other languages besides Visual Basic.

If you use the Visual Basic 6 Upgrade Wizard to convert your code, your integer data types will be adjusted for you by the wizard.

If there is no accessible constructor in the base class that can be called without arguments, Visual Basic cannot generate an implicit call.

Even without generics, Visual Basic has always provided some mechanisms for dealing with objects, regardless of their type.

Describes how to call DLL functions from Visual Basic applications.

Consequently, the elements of an array created in Visual Basic are directly accessible in JScript.

Each Visual Basic 2005 project must be in its own folder.

Provides links to samples that demonstrate Visual Basic in a variety of applications.

In the next section, you will learn how to use the Visual Basic tools to track down and fix errors (commonly called bugs) in your program.

In Visual Basic, adding references to COM objects that have type libraries is similar to doing so in previous versions.

These enumerations are specified by the Visual Basic language and can be used anywhere in your code in place of the actual values.

The Visual Basic compiler creates implicit members corresponding to certain programming elements you declare.

In previous versions of Visual Basic, you could consume interfaces but not create them directly.

In Visual Basic 2005, some of the debugging windows are available only in run mode; when you switch to design mode, the windows are hidden.

In this lesson, you learned a few of the things that you can do with Visual Basic 2005.

Provides a complete reference for the Visual Basic language and its run-time elements.

In the current beta, Visual Basic does not support the Shared keyword on a class declaration.

By default, the HelpFile property contains the name of the Visual Basic Help file.

Windows Help is no longer supported in Visual Basic 2005 and there is no equivalent control for displaying Help.

In Visual Basic 2005, any form with its IsMdiContainer property set to true can act as an MDI container.

Gets or sets a value that determines whether the Visual Basic namespace is imported without having to specify it.

In the Visual Basic Editor, if the Project Explorer pane is not displayed, on the View menu, click Project Explorer.

The Visual Basic Application Model does not provide any context information in the exception.

Sample Windows Forms application written in Visual Basic that includes a variety of reports that use data from Web server log files.

Collections can also be created using another language (such as Visual Basic) or by an ActiveXObject object.

The Visual Basic primitive type String is an alias for System. String, a sequence of Unicode characters.

Discusses conversions classified by whether Visual Basic performs them automatically.

If the method is a static (Shared in Visual Basic) method, the business object is never created and you cannot handle these events.

The following code example instructs the ASP. NET page compiler to use Visual Basic as the inline code language and specifies a class name.

The Visual Basic 2005 Timer component uses the Enabled property to allow you to disable or enable it.

This page links to help on widely used Visual Basic programming tasks.

Public static (Shared in Visual Basic) members of this type are safe for multithreaded operations.

The Visual Basic Editor displays different information in a variety of windows.

Defines a group of Visual Basic settings that are applied to all new projects.

In Visual Basic 2005, Web programming is no longer directly supported.

In Visual Basic, add a module to your Windows-based application by right-clicking the project and choosing Add Module.

You cannot use Optional (Visual Basic) or ParamArray parameters, or overloaded versions, on delegate or event parameters.