How to see errors in an asp.net website?

I just want to see error insteas of asp.net showing me default error Server Error in '/' Application. What should i change in web config?

I used this,

<customErrors mode="RemoteOnly" defaultRedirect="GenericErrorPage.htm">
            <error statusCode="403" redirect="NoAccess.htm" />
            <error st开发者_运维问答atusCode="404" redirect="FileNotFound.htm" />
        </customErrors>

Any suggestion i want to see errors in browser as i do live testing...

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Change this:

<customErrors mode="RemoteOnly" defaultRedirect="GenericErrorPage.htm">

To this:

<customErrors mode="Off" defaultRedirect="GenericErrorPage.htm">

RemoteOnly means you'll see the errors if you're logged onto the web server itself (e.g. http://localhost/) Off means to display the errors to everyone, including remote clients.

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An alternative is to browse to your site using it's localhost url. This will allow you to see the errors, but with the customErrors = "RemoteOnly", users browsing to the site using a non-localhost url will see the friendly error page. Also check the server's eventlog, if you're not confident that you are seeing the full error.