Question

I am trying to access a sharepoint list programmatically in a webpart, like this.

try {       masterList = web.Lists[listId]; } catch(Exception e) {       RenderExceptionMessage(e.Message); } 

The RenderExceptionMessage() method is supposed to show a user-friendly error message inside the webpart.

But the problem is that I am not able to trap the Exception. Instead the webpart page redirects to an access denied page which shows an error message ‘You are currently signed in as: Domain\user’

Also, the message of the exception being caught reads ‘Unable to evaluate expression because the code is optimized or a native frame is on top of the call stack.’

Any idea why this behaves this way?

Answer 1

By default, SharePoint has custom handling for access denied exceptions (including the redirect to the custom page) within page/webservice requests, bypassing the excepton handling in your code.

To disable this custom handling, set SPSecurity.CatchAccessDeniedException to false.