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    <p><code>file</code> attribute</p> <ul> <li>Specifies a relative path to an external file that contains custom application configuration settings</li> <li>specific to the <code>appSettings</code> section</li> <li>will <strong>merge</strong> (and override) settings in the .config file</li> <li>will not cause web application to restart when modifying the specified file</li> <li><a href="http://msdn.microsoft.com/en-US/library/ms228154(v=vs.100).aspx" rel="nofollow noreferrer">http://msdn.microsoft.com/en-US/library/ms228154(v=vs.100).aspx</a></li> <li>Using the <a href="http://msdn.microsoft.com/en-us/library/system.configuration.configuration.aspx" rel="nofollow noreferrer">Configuration</a>.<a href="http://msdn.microsoft.com/en-us/library/system.configuration.configuration.appsettings.aspx" rel="nofollow noreferrer">AppSettings</a>.<a href="http://msdn.microsoft.com/en-us/library/system.configuration.appsettingssection.settings.aspx" rel="nofollow noreferrer">Settings</a>.<a href="http://msdn.microsoft.com/en-us/library/ms134548.aspx" rel="nofollow noreferrer">Add</a> API will result in all settings being merged back into the main <code>.config</code> on a <a href="http://msdn.microsoft.com/en-us/library/system.configuration.configuration.aspx" rel="nofollow noreferrer">Configuration</a>.<a href="http://msdn.microsoft.com/en-us/library/ms134087.aspx" rel="nofollow noreferrer">Save</a> call.</li> <li>since .NET 1.1</li> <li>Exception is not thrown if file does not exist.</li> </ul> <p><code>configSource</code> attribute</p> <ul> <li>can apply to most sections of a configuration file, not just <code>appSettings</code></li> <li>will override the <strong>entire section</strong> with the external file, <strong>no merging</strong></li> <li><a href="http://msdn.microsoft.com/en-US/library/system.configuration.sectioninformation.restartonexternalchanges%28v=vs.100%29.aspx" rel="nofollow noreferrer">CAN cause web application to restart</a></li> <li><a href="http://msdn.microsoft.com/en-US/library/system.configuration.sectioninformation.configsource(v=vs.100).aspx" rel="nofollow noreferrer">http://msdn.microsoft.com/en-US/library/system.configuration.sectioninformation.configsource(v=vs.100).aspx</a></li> <li>Using the <a href="http://msdn.microsoft.com/en-us/library/system.configuration.configuration.aspx" rel="nofollow noreferrer">Configuration</a>.<a href="http://msdn.microsoft.com/en-us/library/system.configuration.configuration.appsettings.aspx" rel="nofollow noreferrer">AppSettings</a>.<a href="http://msdn.microsoft.com/en-us/library/system.configuration.appsettingssection.settings.aspx" rel="nofollow noreferrer">Settings</a>.<a href="http://msdn.microsoft.com/en-us/library/ms134548.aspx" rel="nofollow noreferrer">Add</a> API will result in all settings being added to the file specified in <code>configSource</code> on a <a href="http://msdn.microsoft.com/en-us/library/system.configuration.configuration.aspx" rel="nofollow noreferrer">Configuration</a>.<a href="http://msdn.microsoft.com/en-us/library/ms134087.aspx" rel="nofollow noreferrer">Save</a> call.</li> <li>since .NET 2.0</li> <li><code>System.Configuration.ConfigurationErrorsException</code> is thrown if config source file does not exist.</li> </ul> <p>The <code>file</code> attribute specifies an external file containing custom settings like you do in the appSettings entry of the web.config file. Meanwhile, the external file specified in the <code>configSource</code> attribute contains the settings for the section which you declare the configSource for. For example, if you use the configSource attribute of the pages section, then the external file will contain the settings for the pages section.</p> <blockquote> <p>The custom settings declared in the external config specifified in the file attribute will be merged with the settings in the appSettings section in the web.config file. In the meanwhile, the configSource does not support merging, it means that you'll have to move the entire section settings into the external file.</p> </blockquote> <p><a href="http://www.codeproject.com/Messages/1463547/Re-difference-between-configSource-and-file-attrib.aspx" rel="nofollow noreferrer">http://www.codeproject.com/Messages/1463547/Re-difference-between-configSource-and-file-attrib.aspx</a></p>
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    1. POASP.NET web.config: configSource vs. file attributes
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    1. USMassimiliano Peluso
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    1. COAlso, the "file" attribute allows you to specify files outside the immediate directory tree, which is important for sharing common settings among different sites. Unfortunately, the "configsource" attribute restricts you to files within the currrent tree, so for shared settings you need to specify a virtual directory in IIS.
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      1. USEd Graham
    2. COMy above comment was not entirely correct, and I've apparently missed the somewhat arbitrary five-minute window to edit it! You can't set a virtual directory in IIS to allow "configsource" files to live outside the immediate directory tree. So that really is quite limiting. I solved it by using a junction point (or NTFS hard link) but it's not exactly pretty ...
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