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

Inheritance in VB.NET

In VB.NET inheritance, a class can inherit properties, methods, and events from another class, referred to as the base class or parent class. The class that inherits from the base class is called a child class. Inheritance allows you to create a hierarchy of classes, promoting code reuse and a more organized code structure.

To demonstrate inheritance in VB.NET, let’s create an example with a base class, Animal, and two derived classes, Dog and Cat:

Public Class Animal
    Public Property Name As String
Talk
    Public Overridable Function Talk() As String
        Return "animal noise"
    End Function
End Class

The Dog class will inherit from the Animal class:

Public Class Dog Inherits Animal
    Public Property Breed As String
    Public Overrides Function Talk() As String
    ...