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copied!<p>You <strong>can</strong> have separate configuration file, but you'll have to read it "manually", the <code>ConfigurationManager.AppSettings["key"]</code> will read only the config of the running assembly.</p> <p>Assuming you're using Visual Studio as your IDE, you can right click the desired project → Add → New item → Application Configuration File</p> <p><a href="https://i.stack.imgur.com/CROdR.png" rel="noreferrer"><img src="https://i.stack.imgur.com/CROdRm.png" alt="" title="click for large picture"></a> <a href="https://i.stack.imgur.com/igmeM.png" rel="noreferrer"><img src="https://i.stack.imgur.com/igmeMm.png" alt="" title="click for large picture"></a></p> <p>This will add <code>App.config</code> to the project folder, put your settings in there under <code><appSettings></code> section. In case you're not using Visual Studio and adding the file manually, make sure to give it such name: <em>DllName.dll.config</em>, otherwise the below code won't work properly.</p> <p>Now to read from this file have such function:</p> <pre><code>string GetAppSetting(Configuration config, string key) { KeyValueConfigurationElement element = config.AppSettings.Settings[key]; if (element != null) { string value = element.Value; if (!string.IsNullOrEmpty(value)) return value; } return string.Empty; } </code></pre> <p>And to use it:</p> <pre><code>Configuration config = null; string exeConfigPath = this.GetType().Assembly.Location; try { config = ConfigurationManager.OpenExeConfiguration(exeConfigPath); } catch (Exception ex) { //handle errror here.. means DLL has no sattelite configuration file. } if (config != null) { string myValue = GetAppSetting(config, "myKey"); ... } </code></pre> <p>You'll also have to add reference to System.Configuration namespace in order to have the ConfigurationManager class available.</p> <p>When building the project, in addition to the DLL you'll have <code>DllName.dll.config</code> file as well, that's the file you have to publish with the DLL itself.</p> <p>The above is basic sample code, for those interested in a full scale example, please refer to <a href="//stackoverflow.com/a/41993955/447356">this other answer</a>.</p>

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