IIS Custom Errors

1. Make html with custom message, and save that on any directory
    c:\inetpub\wwwroot\custom_errors\404.html
    c:\inetpub\wwwroot\custom_errors\500.html

2. Alter web.config of c:\inetpub\wwwroot, add next content.

<system.webServer> 

<httpErrors errorMode="Custom" existingResponse="Auto" defaultResponseMode="ExecuteURL">
  <clear />
  <error statusCode="404" path="/custom_errors/404.html" responseMode="ExecuteURL" />
  <error statusCode="500" path="/custom_errors/500.html" responseMode="ExecuteURL" /> 

</httpErrors> 

</system.webServer> 

References:
[1] http://stackoverflow.com/questions/434272/iis7-overrides-customerrors-when-setting-response-statuscode
[2] http://stackoverflow.com/questions/619895/how-can-i-properly-handle-404-in-asp-net-mvc
[3] http://stackoverflow.com/questions/717628/asp-net-mvc-404-error-handling