Error Handling Class Vb.net
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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 Dev centers Retired content Samples We’re sorry. The content you requested has been removed. You’ll be auto redirected in 1 second. Visual Basic Language Reference Statements Q-Z Statements Q-Z Statements Try...Catch...Finally Statement Try...Catch...Finally Statement Try...Catch...Finally Statement RaiseEvent Statement ReDim Statement REM Statement RemoveHandler Statement Resume Statement Return Statement Select...Case Statement Set Statement Stop Statement Structure Statement https://msdn.microsoft.com/en-us/library/aa289505(v=vs.71).aspx Sub Statement SyncLock Statement Then Statement Throw Statement Try...Catch...Finally Statement Using Statement While...End While Statement With...End With Statement Yield Statement 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. Try...Catch...Finally Statement (Visual Basic) Visual Studio 2015 Other Versions Visual https://msdn.microsoft.com/en-us/library/fk6t46tz.aspx Studio 2013 Visual Studio 2012 Visual Studio 2010 Visual Studio 2008 Visual Studio 2005 Visual Studio .NET 2003 Provides a way to handle some or all possible errors that may occur in a given block of code, while still running code.Syntax Copy Try [ tryStatements ] [ Exit Try ] [ Catch [ exception [ As type ] ] [ When expression ] [ catchStatements ] [ Exit Try ] ] [ Catch ... ] [ Finally [ finallyStatements ] ] End Try PartsTermDefinitiontryStatementsOptional. Statement(s) where an error can occur. Can be a compound statement.CatchOptional. Multiple Catch blocks permitted. If an exception occurs when processing the Try block, each Catch statement is examined in textual order to determine whether it handles the exception, with exception representing the exception that has been thrown. exceptionOptional. Any variable name. The initial value of exception is the value of the thrown error. Used with Catch to specify the error caught. If omitted, the Catch statement catches any exception.typeOptional. Specifies the type of class filter. If the value of exc
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 - https://www.tutorialspoint.com/vb.net/vb.net_exception_handling.htm Date & Time VB.Net - Arrays VB.Net - Collections VB.Net - Functions VB.Net - Subs http://edndoc.esri.com/ArcObjectsOnline/GettingStarted/ErrorHandling.htm 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 Email VB.Net - XML Processing VB.Net - Web Programming VB.Net Useful Resources VB.Net error handling - 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 response to an exceptional circumstance that arises while a program is running, such as an attempt to divide by zero. error handling class 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 to as protected code, and the syntax for using Try/Catch looks like the following: Try [ tryStatements ] [ Exit Try ] [ Catch [ exception [ As type ] ] [ When expression ] [ catchStatements ] [ Exit Try
handling is straightforward to implement, and the same concepts are applicable to either VB.NET or C#. Throughout this section, example code will be shown in both languages. VB .NET allows backward compatibility by also providing unstructured exception handling, via the familiar On Error GoTo statement and Err object, although this model is not discussed in this section. Exceptions Exceptions are used to handle error conditions in Visual Studio .NET. They provide information about the error condition. An exception is an instance of a class which inherits from the System.Exception base class. Many different types of exception class are provided by the .NET Framework, and it is also possible to create your own exception classes. Each type extends the basic functionality of the System.Exception class by allowing further access to information about the specific type of error that has occurred. An instance of an Exception class is created and thrown when the .NET Framework encounters an error condition. You can deal with exceptions by using the Try, Catch Finally construct. Try, Catch, Finally This construct allows you to catch errors that are thrown within your code. An example of this construct is shown below. An attempt is made to rotate an envelope, which throws an error. C# try { IEnvelope env = new EnvelopeClass(); env.PutCoords(0D, 0D, 10D, 10D); ITransform2D trans = (ITransform2D) env; trans.Rotate(env.LowerLeft, 1D); } catch (System.Exception ex) { MessageBox.Show("Error: " + ex.Message); } finally { // Perform any tidy up code. } VB.NET Try Dim env As IEnvelope = New EnvelopeClass() env.PutCoords(0D, 0D, 10D, 10D) Dim trans As ITransform2D = env trans.Rotate(env.LowerLeft, 1D) Catch ex As System.Exception MessageBox.Show("Error: " + ex.Message) Finally ' Perform any tidy up code. End Try The Try block is placed around the code which may fail. If an error is thrown within the Try block, the point of execution will switch to the first Catch block. The Catch block handles a thrown error. A Catch block is executed when the Type of a thrown error matches the Type of error specified by the Catch block. You can have more than one Catch block to handle different kinds of errors. The code shown below checks first if the exception thrown is a DivideByZeroException. C# ...