 <p>You can put the configuration settings for any library in the main web.config. It's easy!</p> <p>Connection strings are especially easy. Just add your connection string to the <code>connectionstrings</code> section with the same name it has in the library's app.config, and you're done!</p> <pre><code>&lt;connectionStrings&gt; &lt;add name="Sitefinity" connectionString="your connection string"/&gt; &lt;/connectionStrings&gt; </code></pre> <p>To add configuration settings, at the top of your web config, find the <code>applicationSettings</code> section, and add your section's info. Note: be sure to set your library's settings access modifier to "Public". You can do this in the Properties ui.</p> <pre><code>&lt;sectionGroup name="applicationSettings" type="System.Configuration.ApplicationSettingsGroup, System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"&gt; &lt;section name="Your.Assembly" type="System.Configuration.ClientSettingsSection, System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" /&gt; &lt;/sectionGroup&gt; </code></pre> <p>Then, add the section under <code>applicationSettings</code>.</p> <pre><code>&lt;applicationSettings&gt; &lt;Your.Assembly&gt; &lt;setting name="TestSetting" serializeAs="String"&gt; &lt;value&gt;a test value&lt;/value&gt; &lt;/setting&gt; &lt;/Your.Assembly&gt; &lt;/applicationSettings&gt; </code></pre>