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

Infinite loops

An infinite loop is a loop that continues indefinitely without a condition that can make it terminate. The endless loop can happen unintentionally or as part of the program’s logic. Infinite loops can cause a program to become unresponsive, consume excessive system resources, or crash.

Here’s an example of an infinite loop in VB:

While 1=1
    'code to run
End While

In this example, the 1=1 condition always evaluates to true so that the loop will continue indefinitely. To break out of this loop, you would need to manually interrupt the program execution, such as by pressing Ctrl + C.

While infinite loops are usually unintended and considered bugs, there are cases where intentionally creating infinite loops can be helpful. For instance, an infinite loop can be used in server applications to listen for and handle client requests continuously.

It’s crucial to ensure that the loop condition is appropriately defined...