Any samples on how to use GetPreviousVersion?

The docs says
> You can use the `GetPreviousVersion` method in conjunction with the `Upgrade` method...

But I'm left clueless on where to start. Can we include a code sample here?

Thanks!

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* ID: c6640792-2ea3-8839-93b8-ea03e86d9ef2
* Version Independent ID: 64a8c71d-9513-767e-a5a4-8a519734b16e
* Content: [IApplicationSettingsProvider.GetPreviousVersion(SettingsContext, SettingsProperty) Method (System.Configuration)](https://docs.microsoft.com/en-us/dotnet/api/system.configuration.iapplicationsettingsprovider.getpreviousversion?view=netframework-4.7.2)
* Content Source: [xml/System.Configuration/IApplicationSettingsProvider.xml](https://github.com/dotnet/dotnet-api-docs/blob/master/xml/System.Configuration/IApplicationSettingsProvider.xml)
* Product: **dotnet-api**
* GitHub Login: @dotnet-bot
* Microsoft Alias: **dotnetcontent**