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    <p>What you need can be achieved using <strong>Custom Configuration Sections</strong>. This <a href="http://msdn.microsoft.com/en-us/library/2tw134k3.aspx" rel="nofollow">MSDN article</a> provides some details and samples on how to implement such config sections.</p> <p>If you need simple <strong>key/value</strong> configs, like in the appSettings section, then creating a custom configuration section is quite simple.</p> <p>The first thing you need to do is define your <strong>config section</strong> inside web.config:</p> <pre><code>&lt;configSections&gt; &lt;section name="GmailSettings" restartOnExternalChanges="true" type="System.Configuration.NameValueFileSectionHandler" /&gt; &lt;/configSections&gt; </code></pre> <p>Now inside the web.config file you can <strong>declare</strong> the GmailSettings section and set the location of the external config file that you are going to use for that setting:</p> <pre><code>&lt;GmailSettings configSource="GmailSettings.config"&gt;&lt;/GmailSettings&gt; </code></pre> <p><strong>configSource</strong> specifies the name and location of the external config file used for defining the GmailSettings section. Please note the <code>restartOnExternalChanges</code> attribute used when defining the section. Set it to true if you want the application to be automatically restarted when you modify the GmailSettings.config file (as it does when you modify the web.config file).</p> <p>Below is an example of how to implement the <strong>GmailSettings.config</strong> file:</p> <pre><code>&lt;?xml version="1.0"?&gt; &lt;GmailSettings&gt; &lt;add key="userName" value="blabla"/&gt; &lt;add key="password" value="moreBla"/&gt; &lt;/GmailSettings&gt; </code></pre> <p>You can access the settings from GmailSettings using the <code>ConfigurationManager.GetSection()</code> method or by implementing a <strong>helper class</strong> like the one below:</p> <pre><code>public class GmailSettings { private static readonly GmailSettings _instance = new GmailSettings(); private NameValueCollection _settings = ConfigurationManager.GetSection("GmailSettings") as NameValueCollection; public static GmailSettings Instance { get { return _instance; } } public string this[string key] { get { return _settings[key]; } } } </code></pre> <p>The settings can now be accessed like <code>GmailSettings.Instance["userName"]</code>.</p> <p>Hope this helps.</p>
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    1. POIf an ASP.NET application uses many DLLs, what's the best approach for keeping configurations of each dll separate?
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    1. USFlorin Dumitrescu
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    1. POIf an ASP.NET application uses many DLLs, what's the best approach for keeping configurations of each dll separate?
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    1. COThanks, this is most complete answer. Unfortunately you answered after the bounty was granted and it seems I cannot cancel it now.
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    2. CO@Xaqron, I noticed your question since yesterday but it was only now that I got the time to answer it. I saw that the bounty was already awarded, but I found the question interesting and decided to answer it anyway. ;)
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