Show SharePoint Error Page instead of Yellow ASP.Net error page

To show SharePoint errorpage do below changes in Web.Config file:

<SafeModeMaxControls="200"CallStack="false"DirectFileDependencies="10"TotalFileDependencies="50"AllowPageLevelTrace="false">

and

<customErrorsmode="On" />


To See Error message on Page itself do below changed in Web.Config file

<SafeModeMaxControls="200"CallStack="true"DirectFileDependencies="10"TotalFileDependencies="50"AllowPageLevelTrace="false">

and

<customErrorsmode="Off" />