Visual Basic 2005 for Programmers: Deitel Developer Series, Second Edition

12.1. Introduction

In this chapter, we introduce exception handling. An exception is an indication of a problem that occurs during a program’s execution. The name “exception” comes from the fact that, although the problem can occur, it occurs infrequently. If the “rule” is that a statement normally executes correctly, then the occurrence of a problem represents the “exception to the rule.” Exception handling enables you to create applications that can resolve (or handle) exceptions. In many cases, handling an exception allows a program to continue executing as if no problems were encountered. However, more severe problems may prevent a program from continuing normal execution, instead requiring the program to notify the user of the problem, then ...