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Multiple appSettings section in web.config
<section name="development">
    <appSettings>
    </appSettings>
</section>

<section name="test">
    <appSettings>
    </appSettings>
</section>


string connectionString
   = ConfigurationManager.GetSection("test").AppSettings["connectionString"];

<appSettings>
   <add name="fearofawhackplanet.connectionString" value="your connection string" />
   <add name="cosCallis.connectionString" value="my connection string" />
</appSettings>