ASP.NET web.config: configSource vs. file attributes

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Within an web.config-file in an ASP.NET-application some sections of config, like appSettings and connectionStrings, supports the attributes file and configSource.

What is the difference between using the file-attribute and the configSource-attribute? When should you use which attribute and can you use both?

<?xml version="1.0"?>
<configuration>
  <appSettings file="AppSettings.config">
  </appSettings>
  <connectionStrings configSource="ConnectionStrings.config">      
  </connectionStrings>
  <!-- ... -->
</configuration>

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