I do this so rarely, that I always forget how to do it. Sometimes in a web application, you reference a class library that uses a web service. The web service is not directly added to the web application, so nothing is in the web.config to override, and since it is a class library versus a web application, you need to add a sectionGroup so you won’t throw the yellow screen of death due to an unknown section “applicationSetttings”.
<configSections>
<sectionGroup name="applicationSettings" type="System.Configuration.ApplicationSettingsGroup, System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" >
<section name="ErrorHandler.Properties.Settings" type="System.Configuration.ClientSettingsSection, System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />
</sectionGroup>
</configSections>
<applicationSettings>
<ErrorHandler.Properties.Settings>
<setting name="ErrorHandler_ErrorLoggingWebService_ErrorLoggingWebService"
serializeAs="String">
<value>http://localhost/errorloggingwebservice/errorloggingwebservice.asmx</value>
</setting>
</ErrorHandler.Properties.Settings>
</applicationSettings>
