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

Exit and Continue statements

In VB, the Exit and Continue statements are used to modify the flow of execution in loops and conditional statements.

The Exit statement immediately exits a loop or a Select Case or Do Select statement. When the Exit statement is reached, control passes to the next statement after the loop or the Select Case or Do Select statement.

Here is a VB.NET example that searches for a specific value in a loop and will exit the loop if found:

Dim test_value As Integer = 7
Dim found As Boolean = False
For x As Integer = 1 To 20
    If x = test_value Then
        Found = True
        Exit For
    End If
Next
If found Then
    Console.WriteLine("The search value was found.")
End If

The Continue statement is used to skip to the next loop iteration immediately. When the Continue statement is executed, the loop...