Hi Imar,

I successfully made it through the 1st 2 Try It Out exercises for handling exceptions and global exceptions. But in order to see my Global Exception page (OtherErrors.aspx) I forced an error in the system by commenting out the web.config system.net element (the smpt deliveryMethod stuff). This led to several findings I'd like to get your input on:

1 - The global.asax also uses the mail system, so I had to comment out the send mail command there. But it raised a question of Try-Catch in global.asax. It's probably an academic issue since we need to not have errors in the error handling method, but...

Is that VB (or C#) coding in the global.asax file? And can a Try-Catch be implemented there? Wouldn't that be desirable in order to avoid legitimate errors such as the mail server is down, etc.?

2 - Even after I commented out the induced mail system error in global.asax, I ended up with what I believe is an AJAX script error. The 1st line of the file is: // Name: MicrosoftAjaxWebForms.debug.js

The error was Line: 885
"Error: Sys.WebForms.PageRequestManagerParserErrorExceptio n: The message received from the server could not be parsed."

If I change the web.config <customErrors> element to NOT include "redirectMode="ResponseRewrite", then I don't get the script error and my OtherErrors.aspx appears without error.

Can you explain what's happening there?

I know that's a lot of "cross wiring", but I'm trusting you'll be familiar with it and have some guidance about what I observed.

I just wanted to see OtherErrors.aspx invoked; it turned into more than I expected.

Thanks.

Best Regards,
Alan

Hi Alan,

Yes, good idea to use try/catch there to prevent errors when sending the mail. In the catch you could try to write to a text file (in another try/catch block) to log the error in case the mail server is down.

It can be both, but it needs to be the same language as the rest of the site.

Nope, no idea what's going on.

You can just throw an exception from an existing page to raise an exception.

Hope this helps,

Imar

__________________
Imar Spaanjaars
http://Imar.Spaanjaars.Com
Follow me on Twitter

Author of Beginning ASP.NET 4.5 : in C# and VB, Beginning ASP.NET Web Pages with WebMatrix
and Beginning ASP.NET 4 : in C# and VB.
Did this post help you? Click the button below this post to show your appreciation!