Error Handling Vb Net 2010
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resources Windows Server 2012 resources Programs MSDN subscriptions Overview Benefits Administrators Students Microsoft Imagine Microsoft Student Partners ISV Startups TechRewards Events Community Magazine Forums Blogs Channel 9 Documentation APIs and reference error handling c# Dev centers Retired content Samples We’re sorry. The content you requested has been error handling sql removed. You’ll be auto redirected in 1 second. Visual Basic and Visual C# Visual Basic Developing Applications with error handling java Visual Basic Developing Applications with Visual Basic Exception and Error Handling in Visual Basic Exception and Error Handling in Visual Basic Exception and Error Handling in Visual Basic Using the Visual https://msdn.microsoft.com/en-us/library/ms973849.aspx Basic Development Environment Programming in Visual Basic Development with My (Visual Basic) Accessing Data in Visual Basic Applications Debugging Your Visual Basic Application Exception and Error Handling in Visual Basic Introduction to Exception Handling (Visual Basic) Choosing When to Use Structured and Unstructured Exception Handling (Visual Basic) Types of Errors (Visual Basic) Configuring Warnings in Visual Basic Structured Exception Handling in Visual Basic https://msdn.microsoft.com/en-us/library/s6da8809(v=vs.100).aspx Unstructured Exception Handling in Visual Basic Add Imports Validation Error Dialog Box (Visual Basic) Add Imports Validation Error (Extension Methods) Dialog Box (Visual Basic) Deploying An Application (Visual Basic) Creating and Using Components in Visual Basic Printing and Reporting (Visual Basic) Going Further with Visual Basic Customizing Projects and Extending My with Visual Basic 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. Exception and Error Handling in Visual Basic Visual Studio 2010 Other Versions Visual Studio 2008 Visual Studio 2005 Visual Studio .NET 2003 Visual Basic supports structured exception (error) handling, which allows the program to detect and possibly recover from errors during execution. Visual Basic uses an enhanced version of the Try...Catch...Finally syntax already supported by other languages such as C++. Structured exception handling combines a modern control structure (similar to Select Case or While) with exceptions, protected blocks of code, and filters.Structured exception handling, which is the recommended method of error handling in Visual Basic, makes it easy to create and maint
for Beginners Try ... Catch in VB .NET This lesson is part of an ongoing tutorial. The previous part is here: Runtime Errors VB.NET has a inbuilt class that deals with errors. The Class is called Exception. http://www.homeandlearn.co.uk/NET/nets5p4.html When an exception error is found, an Exception object is created. The coding structure VB.NET uses to deal with such Exceptions is called the Try Catch structure. In the coding area for your button, type the word Try. Then hit http://www.dreamincode.net/forums/topic/87751-error-handling-for-beginners-part-two-try-catch/ the return key on your keyboard. VB.NET completes the rest of the structure for you: Try Catch ex As Exception End Try The Try word means "Try to execute this code". The Catch word means "Catch any errors here". The error handling ex is a variable, and the type of variable it is is an Exception object. Move your line of code from the previous section to the Try part: Try rt1.LoadFile("C:\test10.txt", RichTextBoxStreamType.PlainText) Catch ex As Exception End Try When you run your programme, VB will Try to execute any code in the Try part. If everything goes well, then it skips the Catch part. However, if an error occurs, VB.NET jumps straight to Catch. Add the following to your Catch part: MessageBox.Show(ex.Message) Your error handling vb coding window should look like this: Because ex is an object variable, it now has its own Properties and methods. One of these is the Message property. Run your programme and test it out. Click your button. You should see the following error message: The message is coming from the "additional Information" section of the error message we saw earlier, the one we didn't handle. But the point about this new message box is that it will not crash your programme. You have handled the Exception, and displayed an appropriate message for the user. If you know the kind of error that a programme might throw, you can get what Type it is from the Error message box you saw earlier. This one: Click the View Details links under Actions to see the following: The first line tells us the Type of Exception it is: System.IO.FileNotFoundException You can add this directly to the catch part. Previously, you were just catching any error that might be thrown: Catch ex As Exception But if you know a "file not found" error might be thrown, you can add that to the Catch line, instead of Exception: Catch ex As System.IO.FileNotFoundException You can keep the Exception line as well. (You can have as many Catch parts as you want.) This will Catch any other errors that may occur: Try rt1.LoadFile("C:\test10.txt", RichTextBoxStreamType.PlainText) Catch ex As System.IO.FileNotFoundException MessageBox.Show(ex.Message) Catch ex As Exception MessageBox.Show(ex.Message) End Try There is on
- Part two "Try - Catch" Handling errors with "Try - Catch" - a beginners guide. Rate Topic: 1 Votes #1 oldSwede D.I.C Regular Reputation: 3 Posts: 459 Joined: 08-January 16 Posted 19 February 2009 - 03:30 PM VB.NET: Error handling for beginners - Part two, handling run time errors with "Try - Catch". A tutorial for the beginner on error handling in VB.NET. This - part two - is about basic structured error handling with "Try - Catch" pertaining to run time errors. More info on this can be found by highlighting "Try" and pressing