Try catch in web form


I have a try catch in a (web form) I want to implement a finally and in this check if there are any exceptions thrown .. if yes I have to do some processing in the finally block.

 My question is how can I check in Finally if there are any exceptions been thrown at all .


12/28/2005 12:56:09 AM 93655 articles. 6 followers. Follow

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Exceptions that are thrown will be caught in the catch block, so that is where you will process your exceptions. Finally is used for things such as closing database connections and disposing of objects.

Ryan Olshan
ASPInsider | Microsoft MVP, ASP.NET

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12/28/2005 1:07:40 AM
StrongTypes has got it right. The catch block is where you deal with any thrown exceptions, the finally block is always run.

try {
    // Do some stuff that might throw an exception
catch (Exception e) {
    // Deal with an exception if one is thrown by the code in the try block
finally {
    // Do something that always needs to be done, no matter if there is an exception or not
12/28/2005 1:50:44 AM

Yes I do understand that... I have to som something like this..



Catch(Exception e){



..if no exceptions raised ( smooth flow)

do something




   catch(exp e){




12/28/2005 2:11:16 AM
Normally you would handle this like:

try {
    object obj = new object(); // throws NewException
    obj.DoStuff();   // throws DoStuffException

    // if you get here you know there haven't been any exceptions yet
    obj.Dispose();   // throws DisposeException
catch (NewException ne) {
catch (DoStuffException ds) {
catch (DisposeException de) {

See for Microsoft's try-catch-finally documentation.
12/28/2005 11:59:07 AM


A quick question..any advice as to how to create a DisposeException.


12/28/2005 4:42:30 PM
You just inherit from System.Exception

Most object frameworks come with their own set of exceptions. If you are actually coding your own object, you can just use any of the predefined exception classes that come in the System namespace.

Common exceptions are:

System.ArithmeticException - This is the base class for exceptions that occur during arithmetic operations, such as System.DivideByZeroException and System.OverflowException.

System.ArrayTypeMismatchException - ArrayTypeMismatchException is thrown when a an incompatible object is attpemted to store into an Array.

System.DivideByZeroException - This exception is thrown when an attempt to divide a number by zero.

System.IndexOutOfRangeException - IndexOutOfRangeException is thrown when attempted to access an array using an index that is less than zero or outside the bounds of the array.

System.InvalidCastException - Thrown when an explicit type conversion from a base type or interface to a derived type fails at run time.

System.NullReferenceException - This exception is thrown when an object is accessed but it is null.

System.OutOfMemoryException - OutOfMemoryException is thrown if the 'new' operation (creating new object) fails due to in sufficient memory.

System.OverflowException - OverflowException is thrown when an arithmetic operation overflows.

System.StackOverflowException - StackOverflowException is thrown when the execution stack is exhausted by having too many pending method calls, most probably due to infinite loop.

ArgumentException - The exception that is thrown when one of the arguments provided to a method is not valid.

12/28/2005 5:39:43 PM

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