Where and how to define for my asp.net MVC 3 web application

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From my experience, we should turn custom error to On in release mode and turn it off in debug. To automatically do this, we can use web.config transformation like the following example.

Web.Debug.config

This setting will allow web server to display ASP.NET yellow page that contain useful error information.

<customErrors mode="Off" xdt:Transform="Replace" />

Web.Release.config

In the other hand, we don’t want user to know technical error. We should use custom error page instead of ASP.NET yellow page.

<customErrors mode="On" xdt:Transform="Replace" />

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