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Chapter09 Slides - Programming in V isual Basic 2010 The...

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Opportunity Click to edit Master subtitle style Programming in Visual Basic 2010: The Very Beginner’s Guide Chapter 09 File I/O
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Agenda Homework 8 Debugging Try/Catch Blocks Databases will be next Tuesday
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Try-Catch Blocks Goal of a developer is to write bullet-proof software Crash is the worst possible outcome for a program Most errors can be avoided Most errors can be managed with exception handling Developer should anticipate errors Exception handling The process of handling runtime errors in a program
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When to Use Try-Catch Blocks Empty TextBoxes cause problems Data conversions can cause problems Some numbers cannot be converted to other data types Some strings cannot be converted to numbers Use Try-Catch block to manage possible exceptions Trap - catching and handling runtime errors in a program; errors are trapped with a Try-Catch
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Try-Catch Syntax Try 'Programming statement(s) Catch ex As Exception 'How to handle specific exceptions [Finally] ‘Finally is optional 'Other programming statements End Try
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