Book Image

Visual Basic Quickstart Guide

By : Aspen Olmsted
Book Image

Visual Basic Quickstart Guide

By: Aspen Olmsted

Overview of this book

Whether you’re an absolute beginner or an experienced developer looking to learn the Visual Basic language, this book takes a hands-on approach to guide you through the process. From the very first chapters, you'll delve into writing programs, exploring core concepts such as data types, decision branching, and iteration. Additionally, you’ll get to grips with working with data structures, file I/O, and essential object-oriented principles like inheritance and polymorphism. This book goes beyond the basics to equip you with the skills to read and write code across the entire VB family, spanning VB Script, VBA, VB Classic, and VB.NET, enabling you to handle legacy code maintenance with ease. With clear explanations, practical examples, and hands-on exercises, this book empowers you to tackle real-world software development tasks, whether you're enhancing existing projects or embarking on new ones. It addresses common challenges like distinguishing between the variations of the VB programming language to help you choose the right one for your projects. Don't let VB's extensive legacy daunt you; embrace it with this comprehensive guide that equips you with practical, up-to-date coding skills to overcome the challenges presented by Visual Basic's rich history of over two decades.
Table of Contents (27 chapters)
Free Chapter
1
Part 1:Visual Basic Programming and Scripting
9
Part 2:Visual Basic Files and Data Structures
14
Part 3:Object-Oriented Visual Basic
20
Part 4:Server-Side Development

Classes and fields

In VB, classes are used to define objects with specific properties (fields) and behaviors (methods). Here’s an overview of how classes and fields work in VB.

Class declaration

To define a class in VB, use the Class keyword followed by the class’s name. Here’s an example:

Class MyClass
    ' Class members will be defined here
End Class

Fields

Fields, also known as attributes or variables, are the data members of a class. They represent the properties or characteristics of an object. Fields hold data values that are associated with objects created from the class. Fields are declared within the class, typically at the beginning, and can have different access modifiers (Public, Private, Protected, and so on) to control their visibility and accessibility:

Class MyClass
    Private myField As Integer
    Public anotherField As String
End Class

In the preceding example...