One refers to the settings.cs file [which does not automatically update from app.config if you do not open it and save it — if you edit the app.config file, and one refers to the app.config file, the configuration block in the app file. config is slightly different, and the structure of the service is slightly different from the scene. Your code will interact with objects a little differently, but the end result is that they essentially do the same. Web links are based on version 2.0 and the service link appeared in .NET 3.0 or 3.5 [I'm not sure which one].
You can still write code for web links, but if your application is aimed at environment 2.0, you cannot use links to services.
Benalabaster
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