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Introduction

One of the things that impressed me when I first started learning .NET wasits enhanced exception-handling functionality. By this I mean such features aseasy access to the type of exception thrown, full stack trace and innerexceptions. This makes it easy to still get full information in those placeswhere you just catch a top-level System.Exception. I find this convenient since,if you don't need to take specific action on a particular type of exception, itis tedious to have successive catch handlers for each type of exception that maybe thrown. In any case, even if you do catch specific exceptions you usuallyalso need to catch System.Exception just to cover yourself and prevent programcrashes. Thus I find that I end up catching System.Exception all over the placein my code. A typical scenario is that in Windows Forms and ASP.NET Web Formsapplications, all of my non-trivial event handlers end up containing try-catchSystem.Exception blocks.

The trouble is that this does still clutter up the code somewhat and doesn'treally seem quite right. Is there a better way?

The better way

A couple of months ago someone posted a message on one of Microsoft's .NETnewsgroups asking just this question. In having catch System.Exception all overthe place what you're really doing is a 'catch-all,' i.e., you'retrying to catch unhandled exceptions - exceptions that you don't knowabout.

One of Microsoft's developers responded to the post and pointed out that weshould not use exception blocks to catch unhandled exceptions. Instead,depending on our type of application, Console, Windows or ASP.NET, we shoulduse one of .NET's unhandled exception event handlers. This means that we'll justhave one error handler to handle all unhandled exceptions. When such anexception is generated we can provide the user with the option of continuing oraborting the application.

This is documented in the .NET Help but it doesn't really stand out in thevarious exceptionhandling topics. You can find some discussion for ASP.NET in thearticle, Exception Management in .NET.In the discussion that follows I describe how to manageunhandled exceptions in Windows Forms applications.

Consider a simple Windows Forms application containing a single form with twobuttons and a text box. The discussion is in C# but a full example follows inboth C# and Visual Basic .NET.

The Add button just adds my name to the text box. The Remove button clearsit. Suppose the Add button throws an exception. Hitherto, I would have donesomething like this.

(Normally, I would only do this if the Add function were performing someelaborate operation - typically calling other non-trivial routines - but I'm here just illustrating theprocess.)

But by writing an unhandled exception event handler delegate we can dispensewith the try-catch block above. The signature for the delegate looks like this.

And this is how we hook it up.

So the Add function can now look like this.

Example

Here is the complete example in C# and Visual Basic .NET (with Windows Form designer generated codeomitted). I have also moved the exception-handling event into an assembly-wideclass so that it can be accessed by other forms. When an unhandled exception isreceived an AbortIgnoreRetry dialog is displayed giving a full description ofthe error. Of course, in a production version we would just inform the user ofan application error and log the details.

C# Implementation

Visual Basic .NET Implementation

Console and ASP.NET Applications

For Console applications you should use theSystem.AppDomain.UnhandledException event. To hook it up you would write:

And the event handler looks like this.

For ASP.NET applications you use the System.Web.HttpApplication.Error eventwhich is placed in the Global.asax file. This might look something like:

Following Core Elements Unit Safety Program Exception On My Phone Download

Following Core Elements Unit Safety Program Exception On My Phone Free