Error Handling Tutorial Vb.net
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VB.Net - Program Structure VB.Net - Basic Syntax VB.Net - Data Types VB.Net - Variables VB.Net - Constants VB.Net - Modifiers VB.Net - Statements VB.Net - Directives VB.Net - Operators VB.Net - Decision Making VB.Net - Loops VB.Net - Strings VB.Net - Date & Time VB.Net - Arrays VB.Net - Collections VB.Net - Functions VB.Net - Subs VB.Net - Classes & Objects VB.Net - Exception Handling VB.Net - File Handling VB.Net - Basic Controls VB.Net - Dialog Boxes VB.Net - Advanced Forms VB.Net - Event Handling VB.Net Advanced Tutorial VB.Net - Regular Expressions VB.Net - Database Access VB.Net - Excel Sheet VB.Net - Send https://msdn.microsoft.com/en-us/library/ms973849.aspx Email VB.Net - XML Processing VB.Net - Web Programming VB.Net Useful Resources VB.Net - Quick Guide VB.Net - Useful Resources VB.Net - Discussion Selected Reading Developer's Best Practices Questions and Answers Effective Resume Writing HR Interview Questions Computer Glossary Who is Who VB.Net - Exception Handling Advertisements Previous Page Next Page An exception is a problem that arises during the execution of a program. An exception is a https://www.tutorialspoint.com/vb.net/vb.net_exception_handling.htm response to an exceptional circumstance that arises while a program is running, such as an attempt to divide by zero. Exceptions provide a way to transfer control from one part of a program to another. VB.Net exception handling is built upon four keywords: Try, Catch, Finally and Throw. Try: A Try block identifies a block of code for which particular exceptions will be activated. It's followed by one or more Catch blocks. Catch: A program catches an exception with an exception handler at the place in a program where you want to handle the problem. The Catch keyword indicates the catching of an exception. Finally: The Finally block is used to execute a given set of statements, whether an exception is thrown or not thrown. For example, if you open a file, it must be closed whether an exception is raised or not. Throw: A program throws an exception when a problem shows up. This is done using a Throw keyword. Syntax Assuming a block will raise an exception, a method catches an exception using a combination of the Try and Catch keywords. A Try/Catch block is placed around the code that might generate an exception. Code within a Try/Catch block is referred t
run out of memory , file does not exist in the given path , network connections are dropped etc. More specifically for better understanding http://vb.net-informations.com/language/vb.net_exceptions.htm , we can say it as Runtime Errors . In .NET languages http://www.codeproject.com/Articles/13658/VB-NET-Error-Handling , Structured Exceptions handling is a fundamental part of Common Language Runtime . It has a number of advantages over the On Error statements provided in previous versions of Visual Basic . All exceptions in the Common Language Runtime are derived from a single base class , error handling also you can create your own custom Exception classes. You can create an Exception class that inherits from Exception class . You can handle Exceptions using Try..Catch statement . Try code exit from Try Catch [Exception [As Type]] code - if the exception occurred this code will execute exit from Catch
Finally The code in the finally block will error handling tutorial execute even if there is no Exceptions. That means if you write a finally block , the code should execute after the execution of try block or catch block. Try code exit from Try Catch [Exception [As Type]] code - if the exception occurred this code will execute exit Catch Finally code - this code should execute , if exception occurred or not The following example trying to divide a number by zero. Try Dim i As Integer Dim resultValue As Integer i = 100 resultValue = i / 0 MsgBox("The result is " & resultValue) Catch ex As Exception MsgBox("Exception catch here ..") Finally MsgBox("Finally block executed ") End Try How to throw Exception You should throw exceptions only when an unexpected or invalid activity occurs that prevents a method from completing its normal function. You can throw any type of Throwable object using the keyword throw. . More about.... throw exception How to create a custom exception We can create our own exceptions by extending 'Exception' class. It will simplify and imprArticles Technical Blogs Posting/Update Guidelines Article Help Forum Article Competition Submit an article or tip Post your Blog quick answersQ&A Ask a Question about this article Ask a Question View Unanswered Questions View All Questions... C# questions Linux questions ASP.NET questions SQL questions VB.NET questions discussionsforums All Message Boards... Application Lifecycle> Running a Business Sales / Marketing Collaboration / Beta Testing Work Issues Design and Architecture ASP.NET JavaScript C / C++ / MFC> ATL / WTL / STL Managed C++/CLI C# Free Tools Objective-C and Swift Database Hardware & Devices> System Admin Hosting and Servers Java .NET Framework Android iOS Mobile SharePoint Silverlight / WPF Visual Basic Web Development Site Bugs / Suggestions Spam and Abuse Watch features Competitions News The Insider Newsletter The Daily Build Newsletter Newsletter archive Surveys Product Showcase Research Library CodeProject Stuff communitylounge Who's Who Most Valuable Professionals The Lounge The Insider News The Weird & The Wonderful The Soapbox Press Releases Non-English Language > General Indian Topics General Chinese Topics help What is 'CodeProject'? General FAQ Ask a Question Bugs and Suggestions Article Help Forum Site Map Advertise with us About our Advertising Employment Opportunities About Us Articles » Platforms, Frameworks & Libraries » .NET Framework » General ArticleBrowse CodeStatsRevisionsAlternatives Comments (10) Add your ownalternative version Tagged as .NETWindowsVisual-StudioDev Stats 140.6K views12 bookmarked Posted 2 Apr 2006 VB .NET Error Handling Ujwal Watgule, 2 Apr 2006 CPOL 2.64 (18 votes) 1 2 3 4 5 2.64/5 - 18 votesμ 2.94, σa 3.15 [?] Rate this: Please Sign up or sign in to vote. Introductory tutorial on Visual Basic error handling Introduction In this article, you’ll learn how to build blocks of code that handle run time errors, also referred as exceptions which occur as a result of normal operating conditions for example. Errors due to a disk not being in the drive or to an offline printer. Visual Basic .NET includes the Try---Catch code block, a new syntax for handling error. In this article you’ll learn how to trap run time errors using Try---Catch code block, an