How to set configuration in Empty SharePoint Project

hi

you need to add new entry in configuration/appSettings section:

<appSettings>
    <add key="ServiceUrl" value="http://localhost:449555" />
</appSettings>

After that you will be able to use it in your code like this:

var rc = new RestClient(ConfigurationManager.AppSettings["ServiceUrl"]);

In order to add new setting to appSettings section via SPWebConfigModifications, see the following post: Adding and Removing keys from appSettings in web.config.

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