Structured Exception Handling in VB.net

By: Steven Holzner Emailed: 1586 times Printed: 2040 times    

Latest comments
By: rohit kumar - how this program is work
By: Kirti - Hi..thx for the hadoop in
By: Spijker - I have altered the code a
By: ali mohammed - why we use the java in ne
By: ali mohammed - why we use the java in ne
By: mizhelle - when I exported the data
By: raul - no output as well, i'm ge
By: Rajesh - thanx very much...
By: Suindu De - Suppose we are executing

Visual Basic also supports structured exception handling. In particular, Visual Basic uses an enhanced version of the TryCatchFinally syntax already supported by other languages, such as Java. Here's an example that follows our previous example handling a division by zero exception; I start by creating a Try block—you put the exception-prone code in the Try section and the exception-handling code in the Catch section:

Module Module1
    Sub Main()
        Try
        
        Catch e As Exception
        
        End Try
    End Sub
End Module

Note the syntax of the Catch statement, which catches an Exception object that I'm naming e. When the code in the Try block causes an exception, I can use the e.ToString method to display a message:

Module Module1
    Sub Main()
        Dim int1 = 0, int2 = 1, int3 As Integer
        Try
            int3 = int2 / int1
            System.Console.WriteLine("The answer is {0}", int3)
        Catch e As Exception
            System.Console.WriteLine(e.ToString)
        End Try
    End Sub
End Module

Here's what you see when you run this code:

System.OverflowException: Exception of type System.OverflowException was
thrown.
   at Microsoft.VisualBasic.Helpers.IntegerType.FromObject(Object Value)
   at ConsoleHello.Module1.Main() in
   C:\vbnet\ConsoleHello\Module1.vb:line 5

Besides using the e.ToString method, you can also use the e.message field, which contains this message:

Exception of type System.OverflowException was thrown.

VB.net Home | All VB.net Tutorials | Latest VB.net Tutorials

Sponsored Links

If this tutorial doesn't answer your question, or you have a specific question, just ask an expert here. Post your question to get a direct answer.



Bookmark and Share

Comments(0)


Be the first one to add a comment

Your name (required):


Your email(required, will not be shown to the public):


Your sites URL (optional):


Your comments:



More Tutorials by Steven Holzner
Changes in Controls from VB6 to VB.net
Throwing a Custom Exception in VB.net
Throwing an Exception in VB.net
Using Finally in VB.net
Using Multiple Catch Statements in VB.net
Exception Filtering in the Catch Block in VB.net
Raising an Exception Intentionally in VB.net
Getting an Exception's Number and Description in VB.net
Using On Error GoTo 0 in VB.net
Using Resume Next and Resume Line in VB.net
Understanding Scope in VB.net
Properties in VB.net
Procedure Delegates in VB.net
Preserving a Variable's Values between Procedure Calls in VB.net
Specifying Optional Arguments with default values in Procedures in VB.net

More Tutorials in VB.net
Scope in VB.net
Unstructured Exception Handling in VB.net
Structured Exception Handling in VB.net
Creating Sub Procedures in VB.net
Creating Functions in VB.net
Passing a Variable Number of Arguments to Procedures in VB.net
Specifying Optional Arguments with default values in Procedures in VB.net
Preserving a Variable's Values between Procedure Calls in VB.net
Procedure Delegates in VB.net
Properties in VB.net
Understanding Scope in VB.net
Using Resume Next and Resume Line in VB.net
Using On Error GoTo 0 in VB.net
Getting an Exception's Number and Description in VB.net
Raising an Exception Intentionally in VB.net

More Latest News
Most Viewed Articles (in VB.net )
Your first VB.NET Crystal Reports - A step by step guide
How to export from DataGridView to excel using VB.net
Operators in VB.net
Sub Procedures and Functions in VB.net
How To Connect To A MySql Database in VB.net
Update cell data in an Excel file using OLEDB in VB.net
Multi threaded Socket Programming in VB.net
String.Contains (), compare, clone in VB.net
Sending email using CDOSYS in VB.net
Throwing an Exception in VB.net
Visual Basic Statements
String equals, Copy to & Copy to in VB.net
Using Excel 2007 Chart in VB.NET 2005
How to read URL Content through VB.net code
Client Socket Program sample in VB.net
Most Emailed Articles (in VB.net)
How to export from DataGridView to excel using VB.net
“Using If with And” and Comparing two integers using If
While Loop in VB.net
How to find IP Address of Host using .net code
The Select Case statement in VB.net
The For Loop in VB.net
Do Loop in VB.net
Sub Procedures and Functions in VB.net
Export Chart from Excel 2007 as Picture file in VB.NET 2005
Using Excel 2007 Chart VB.net Picture Box
Using Excel 2007 DataBar in VB.net
Multi Threaded Server Socket Programming in VB.net
Send SMS using VB code
Using Finally in VB.net
Debug and Release Versions in .NET