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

The GoTo statement

In VB, the GoTo statement transfers control to a specific line or label within your code. While the GoTo statement is generally discouraged in modern programming practices, it is still supported in Visual Basic for specific scenarios.

The basic syntax of the GoTo statement in Visual Basic is as follows:

goto line_or_label

Here, line_or_label refers to the line number or label you want to transfer control to. To see GoTo usage, consider the following example:

Sub GotoProc()
    Dim num1 As Integer = 20
    If num1 > 10 Then
        GoTo Label1
    Else
        GoTo Label2
    End If
Label1:
    Console.WriteLine("The number is above 10.")
    GoTo EndLabel
Label2:
    Console.WriteLine("The number is equal or under 10....