app.config with a protection provider

app.xml

<?xml version="1.0" encoding="utf-8"?>
<configuration>
  <configSections>
    <section name="CustomConfig" type="garfbradaz.Common.CustomConfigSections.EncryptedUserCredentialsSection, garfbradaz.Common" />
  </configSections>
  <appSettings>
  </appSettings>
  <startup>
    <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.0" />
  </startup>
  <CustomConfig>
    <EncryptedUserCredentials>
      <EncryptedUserCredential service="keyToCredential" userName="firstname.lastname" password="pwd12345@" />
    </EncryptedUserCredentials>
  </CustomConfig>
    <configProtectedData>
    <providers>
        <add keyContainerName="MyCustomKeys"
                 useMachineContainer="true"
                 name="MyEncryptionProvider"
                 type="System.Configuration.RsaProtectedConfigurationProvider"/>
    </providers>
</configProtectedData>
 </configuration>