Learn Visual Basic 6.0
What is Visual Basic?
- Visual Basic is a tool that allows you to develop Windows (Graphic User Interface GUI) applications. The applications have a familiar appearance to the user.
- Visual Basic is event-driven, meaning code remains idle until called upon to respond to some event (button pressing, menu selection, …). Visual Basic is governed by an event processor. Nothing happens until an event is detected. Once an event is detected, the code corresponding to that event (event procedure) is executed. Program control is then returned to the event processor.
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Application (Project) is made up of:
-> Forms - Windows that you create for user interface
-> Controls - Graphical features drawn on forms to allow user interaction (text boxes, labels, scroll bars, command buttons, etc.) (Forms and Controls are objects.)
-> Properties - Every characteristic of a form or control is specified by a property. Example properties include names, captions, size, color, position, and contents. Visual Basic applies default properties. You can change properties at design time or run time.
-> Methods - Built-in procedure that can be invoked to impart some action to a particular object.
-> Event Procedures - Code related to some object. This is the code that is executed when a certain event occurs.
-> General Procedures - Code not related to objects. This code must be invoked by the application.
-> Modules - Collection of general procedures, variable declarations, and constant definitions used by application.
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Tags: ADO, basic, database management, exception handling, file I/O, file manipulations, Graphics, VB6, VBA, Windows API, Windows Forms
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