Debugging Error Handling Vb
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Visual Basic Programmer's Guide (All Editions) Part 2: What Can You Do With Visual Basic? Part 2: What Can You Do error handling vba With Visual Basic? Debugging Your Code and Handling Errors Debugging Your Code and Handling Errors Debugging Your Code and Handling Errors Creating a User Interface Using Visual Basic's Standard Controls More About Programming Programming
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with Objects Programming with Components Responding to Mouse and Keyboard Events Working with Text and Graphics Debugging Your Code and Handling Errors How to Handle Errors Designing an Error Handler Error Handling Hierarchy Testing Error Handling by Generating Errors Inline Error Handling Centralized Error Handling Turning Off Error Handling Error Handling with ActiveX Components Approaches to Debugging Avoiding Bugs Design Time, Run Time, and Break Mode Using the Debugging Windows error handling c# Using Break Mode Running Selected Portions of Your Application Monitoring the Call Stack Testing Data and Procedures with the Immediate Window Special Debugging Considerations Tips for Debugging Processing Drives, Folders, and Files Designing for Performance and Compatibility International Issues Distributing Your Applications TOC Collapse the table of content Expand the table of content This documentation is archived and is not being maintained. This documentation is archived and is not being maintained. Visual Basic Concepts Visual Studio 6.0 Debugging Your Code and Handling Errors No matter how carefully crafted your code, errors can (and probably will) occur. Ideally, Visual Basic procedures wouldn't need error-handling code at all. Unfortunately, sometimes files are mistakenly deleted, disk drives run out of space, or network drives disconnect unexpectedly. Such possibilities can cause run-time errors in your code. To handle these errors, you need to add error-handling code to your procedures. Sometimes errors can also occur within your code; this type of error is commonly referred to as a bug. Minor bugs — for example, a cursor that doesn't behave as expected — can be frustrating or inconvenient. More severe bugs can cause an application to stop responding to commands, possibly requiring the user to restart the application, losing whatever work hasn't been save
for Beginners Error Handling and Debugging in VB .NET Debugging your code is something you will need to do. Unless you write perfect code
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every time, there's no getting away from it. In this section, we'll take
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a look at ways you can track down errors using VB.NET. Types of Error Programming errors are generally broken down visual basic error handling into three types: Design-time, Runtime, and Logic errors. A Design-time error is also known as a syntax error. These occur when the environment you're programming in doesn't understand your code. These are easy https://msdn.microsoft.com/en-us/library/aa716196(v=vs.60).aspx to track down in VB.NET, because you get a blue wiggly line pointing them out. If you try to run the programme, you'll get a dialogue box popping up telling you that there were Build errors. Runtime errors are a lot harder to track down. As their name suggests, these errors occur when the programme is running. They happen when your programme tries to do something it shouldn't http://www.homeandlearn.co.uk/NET/nets5p1.html be doing. An example is trying to access a file that doesn't exist. Runtime errors usually cause your programme to crash. If and when that happens, you get the blame. After all, you're the programmer, and you should write code to trap runtime errors. If you're trying to open a database in a specific location, and the database has been moved, a Runtime error will occur. It's your job to predict a thing like this, and code accordingly. Logic errors also occur when the programme is running. They happen when your code doesn't quite behave the way you thought it would. A classic example is creating an infinite loop of the type "Do While x is greater than 10". If x is always going to be greater than 10, then the loop has no way to exit, and just keeps going round and round. Logic errors tend not to crash your programme. But they will ensure that it doesn't work properly. In the next few pages, we'll take a closer look at all three types of error. Move on to Design Time Errors in VB .NET --> Back to the VB NET Contents Page © All course material copyright Home and Learn
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