Avoid SharePoint default error screen

I'm developing custom component for SharePoint and when I get some errors I get from SharePoint the de开发者_运维问答fault error screen. Is there a way to avoid it and get the IIS asp error instead? Moreover, are SharePoint Logs the only place to get more information about errors and exceptions?

Thank you, bye bye...

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What version of SharePoint are you using?

If you're using SharePoint 2010, you can enable the Developer Dashboard to get access to debug information, including trace logs. See http://blogs.technet.com/b/speschka/archive/2009/10/28/using-the-developer-dashboard-in-sharepoint-2010.aspx

You can also enable ASP.NET Tracing in your web.config file (be careful) to get trace information about the error. See http://msdn.microsoft.com/en-us/library/bb386420.aspx

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If under "some errors" you mean access denied cases you need to turn off default handling that redirects to "sign in as other user" page. See CatchAccessDeniedException (http://msdn.microsoft.com/en-us/library/microsoft.sharepoint.spsecurity.catchaccessdeniedexception.aspx)