F#: Extract key value pairs from an app config file

The following snippet extracts key value pairs from the AppSettings section of an app config file:

        let appSettings = ConfigurationManager.AppSettings
        let serviceKeys = ConfigurationManager.AppSettings.AllKeys 
                           |> Seq.filter (fun k -> k.ToString().EndsWith "Fn") 
                           |> Seq.map    (fun k -> (k,appSettings.GetValues(k).First()))
    <add key="MyAzureFn"       value="some_value_1"/>
    <add key="MyOtherAzureFn"  value="some_value_2"/>
    <add key="MyThirdAzureFn"  value="some_value_3"/>

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