title: Where and how to define <customErrors mode=”on”> for my asp.net MVC 3 web application
body: <p>I want to set the custome error to be true to prevent users from viewing detailed info about my application. But I cannot find where I should write this <code>&lt;customErrors mode="on"&gt;</code>; should it be in the web.config or in the web, debug.config or else where?</p>
  
  <p>BR</p>