How To Throw Error Message In Vb.net
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 Samples Retired content 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 Throw Statement Throw Statement Throw Statement RaiseEvent Statement ReDim Statement REM Statement RemoveHandler Statement Resume Statement Return Statement Select...Case Statement Set Statement Stop Statement Structure Statement 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. Throw Statement (Visual Basic) Visual Studio 2015 Other Versions Visual Studio 2013 Visual Studio 2012 Visual Studio 2010 Visual Studio 2008 Visual Studio 2005 Visual Studio .NET 2003 Throws an exception within a procedure.Syntax Copy Throw [ expression ] PartexpressionProvides information about the exception to be thrown. Optional when residing in a Catch statement, otherwise required.RemarksThe Throw statement throws an exception that you can handle with structured exception-handling code (Try...Catch...Finally) or unstructured exception-handling code (On Error GoTo). You can use the Throw statement to trap errors within your code because Visual Basic moves up the call stack until it finds the appropriate exception-handling code. A Throw statement with no expression can only be used in a Catch statement, in which case the statement rethrows the exception currently being handled by the Catch statement.The Throw statement resets the call stack for the expression exception. If expression is not provided, the call stack is left unchanged. You can access the call stack for the exception through the StackTrace property.ExampleThe following code uses the Throw statement to throw an exception: VB Copy ' Throws a new exception. Throw New System.Exception("An exception has occurred.") RequirementsNamespace: Microsoft.VisualBasicModule: InteractionAssembly: Visual Basic Runtime Library (in Microsoft.VisualBasic.dll)See AlsoTry...Catch...Finally Statement (Visual Basic)On Error St
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 Samples Retired content We’re sorry. The content you requested has been removed. You’ll be auto redirected in 1 second. Exception and Error Handling in Visual Basic Structured Exception Handling in Visual Basic Exception Handling Tasks (Visual Basic) Exception Handling Tasks (Visual Basic) How to: Display an Exception's Message https://msdn.microsoft.com/en-us/library/ty79csek.aspx in Visual Basic How to: Display an Exception's Message in Visual Basic How to: Display an Exception's Message in Visual Basic How to: Catch an Exception in Visual Basic How to: Throw an Exception in Visual Basic How to: Implement I/O Try...Catch Blocks in Visual Basic How to: Test Code with a Try…Catch Block in Visual https://msdn.microsoft.com/en-us/library/cbc51cdy(v=vs.100).aspx Basic How to: Clean up Resources with a Try…Finally Block in Visual Basic How to: Filter Errors in a Catch Block in Visual Basic How to: Display an Exception's Message in Visual Basic How to: Create New Exception Classes in Visual Basic How to: Check an Exception's Inner Exception (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. How to: Display an Exception's Message in Visual Basic Visual Studio 2010 Other Versions Visual Studio 2008 Visual Studio 2005 The exception object includes a number of properties that help identify the code location, the type, the Helpfile URL, and the reason for the exception. One of these, the Message property, describes the current exception.To display the string associated with an exceptionUse the Message property to display information about the current exception. This example catches a WebException and displays the associated message. VB Copy Try Throw N
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://resources.esri.com/help/9.3/arcgisengine/dotnet/3bb024fa-ed32-4773-b2dd-f5d49c563f41.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 how to - 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 how to throw 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 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
The constructs used may be new to Visual Basic users but should be familiar to users of C++ or Java. In this topic Exception handling Using exceptions Try, Catch, and Finally construct Code without exception handling Errors from COM components Throwing errors and the exception hierarchy Writing your error handler Exception handling Structured exception handling implementation is straightforward, and the same concepts are applicable to VB.NET or C#. VB.NET allows backward compatibility by also providing unstructured exception handling via the familiar OnError GoTo statement and Err object, although this model is not discussed in this topic. Using exceptions Exceptions are used to handle error conditions in Visual Studio .NET and provide information about the error condition. An exception is an instance of a class that inherits from the System.Exception base class. Many different types of exceptions are provided by the .NET Framework, and it is also possible to create your own exceptions. Each type extends the basic functionality of the System.Exception by allowing further access to information about the specific type of error that has occurred. An instance of an exception is created and thrown when the .NET Framework encounters an error condition. You can handle exceptions by using the Try, Catch, and Finally construct. Try, Catch, and Finally construct 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. See the following code example: [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); } { // Clean up the 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) ' Clean up the code. End TryPlace a Try block around code that can fail. I