Error Trapping Visual Basic
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Handling in Visual Basic Exception and Error Handling in Visual Basic Exception and Error Handling in Visual Basic Using the Visual 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 visual basic exception 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 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 po
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Development Articles and Overviews Upgrading to Microsoft .NET Upgrading to Microsoft .NET Error Handling in Visual Basic .NET Error Handling in Visual Basic .NET Error Handling in Visual https://msdn.microsoft.com/en-us/library/s6da8809(v=vs.100).aspx Basic .NET ADO.NET for the ADO Programmer Building an N-Tier Application in .NET Calling a .NET Component from a COM Component Calling COM Components from .NET Clients Common .NET Libraries for Developers Comparing System.Xml in Visual Studio .NET to Microsoft.XMLDOM in Visual Studio 6.0 Converting ASP to ASP.NET Creating Classes in Visual Basic .NET Creating Components https://msdn.microsoft.com/en-us/library/ms973849.aspx in .NET Creating a Windows Form User Control Data Binding with Windows Forms and ADO.NET Designing a .NET Application Designing for Web or Desktop? Determining When to Use Windows Installer Versus XCOPY Differences Between Visual Basic 6.0 and .NET Controls Distributed Transactions in Visual Basic .NET Error Handling in Visual Basic .NET Getting Started with Windows Forms Inheritance and Interfaces Inheritance from a Base Class in Microsoft .NET Interacting with Message Queues Introduction to ASP.NET and Web Forms Introduction to Visual Studio .NET Managing Versions of an Application Migrating from the SOAP Toolkit to Web Services Overloading Methods in Visual Basic .NET Performing Drag-and-Drop Operations Raising Events and Responding to Events Replacing API Calls with .NET Framework Classes Structuring a .NET Application For Easy Deployment Understanding and Using Assemblies and Namespaces in .NET Using ActiveX Controls with Windows Forms in Visual Studio .NET Using ADO.NET Using COM+ Services in .NET Using Web Services Instead of DCOM Variable and Method Scope in Microsoft .NET Working with MDI Applica
in many circumstances. For example, suppose you try to open a text file that the user has deleted. When a compiled program has an error like this, an error message http://www.afralisp.net/archive/vba/error.htm isdisplayed and the program ends. Although you cannot predict and write code for every possible type of error, "File Not Found" errors are fairly easy to handle. If you do not write code towork http://www.dreamincode.net/forums/topic/82982-error-handling-in-vb/ around the error, you can at least provide a message that makes more sense before ending the program. The "On Error" Statement The most common way to handle error conditions is to use error trapping Visual Basic's"On Error" statement.The "On Error" statement interrupts the normal flow of your program when an error occurs and begins executing your error handling code. A typical use is as follows :
On Error Goto FileOpenError When this statement is executed, any errors that occur in subsequentstatements cause Visual Basic to stop normal line-by-line execution andjump to the statement labeled as "FileOpenError". Labeling Code Lines Line visual basic exception labels in Visual Basic are similar to the line numbers of early BASIC.In Visual Basic, line labels can include text if you want, but each label mustbe unique. They are followed by a colon (:), as in the following example : Private Sub Form_Load () On Error Goto FileOpenError Open "C:\SOMEFILE.TXT" For Unput As #1 Line Input #1, sData Exit Sub FileOpenError: MsgBox "There was a problem opening the file. Stop for coffee!" End End Sub In the preceding sample code, if the "Open" or "Line Input" statements causean error, the statements starting at the label "FileOpenError" are executed,causing the message to be displayed and ending the program. You should note a few points about the sample code. First, note the locationand style of the error handling routine. It is usually placed near the end of thesubroutine, with the label not indented to indicate a special section of code. Second, and more important, note the "Exit Sub" statement after the "Open" statement. It is necessary to prevent the error handler routine from executingeven when the "Open" statement was successful. Controlling Program Flow After an Error In the preceding code example, you simply end the program if anVB Definition and a Simple Example for beginners Rate Topic: #1 Nikhil_07n The cheese stands alone.. Reputation: 54 Posts: 2,490 Joined: 09-January 09 Posted 26 January 2009 - 08:24 PM Intro Error handling is an essential procedure in Visual Basic programming because it can help make the program error-free. An error-free program can run smoothly and efficiently, and the user does not have to face all sorts of problems such as program crash or system hang. Errors often occur due to incorrect input from the user. For example, the user might make the mistake of attempting to ask the computer to divide a number by zero which will definitely cause system error. Another example is the user might enter a text (string) to a box that is designed to handle only numeric values such as the weight of a person, the computer will not be able to perform arithmetic calculation for text therefore will create an error. These errors are known as synchronous errors. Therefore a good programmer should be more alert to the parts of program that could trigger errors and should write errors handling code to help the user in managing the errors. Writing errors handling code should be considered a good practice for Visual Basic programmers, so do try to finish a program fast by omitting the errors handling code. However, there should not be too many errors handling code in the program as it create problems for the programmer to maintain and troubleshoot the program later. Writing the Errors Handling Code : We shall now learn how to write errors handling code in Visual Basic. The syntax for errors handling is On Error GoTo program_label where program_label is the section of code that is designed by the programmer to handle the error committed by the user. Once an error is detected, the program will jump