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copied!<p>You can't actually specify <code><appSettings></code> in your <code>applicationHost.config</code> file. This is because <code>applicationHost.config</code> defines settings specific to IIS only. You can review the <code>applicationHost.config</code> schema to confirm this:</p> <blockquote> <p><code>%systemroot%\System32\inetsrv\config\schema\IIS_schema.xml</code></p> </blockquote> <p>If you try to edit <code>applicationHost.config</code> and add an <code><appSetting></code> section to a site or under a <code><location path="..."></code> section you will get an error (IIS may not start and IIS MMC console will display a configuration error).</p> <p>If you configure a global application setting in IIS manager this actually gets configured in the master <code>web.config</code> file that matches the default .NET Framework version setting in IIS.</p> <p><code><appSettings/></code> is specific to the .NET Framework and can only be configured in:</p> <pre> %SYSTEMROOT%\Microsoft.NET\Framework\[framework version]\CONFIG\machine.config %SYSTEMROOT%\Microsoft.NET\Framework\[framework version]\CONFIG\web.config %SYSTEMROOT%\Microsoft.NET\Framework64\[framework version]\CONFIG\machine.config %SYSTEMROOT%\Microsoft.NET\Framework64\[framework version]\CONFIG\web.config </pre> <p>and of course your application's <code>app.config</code> or <code>web.config</code> files.</p> <p>My advice would be to keep these settings local to your application unless there is the rare occasion where you need some value to be available globally.</p> <p><em>Update:</em></p> <p>Now that I understand your problem - you have multiple IIS sites which all point to the same physical folder - there is a way to approach this.</p> <p>You could have a configuration table in your database that has a primary key of whatever the <code>HTTP_HOST</code> value is. This maps to a prefix, for example:</p> <pre> Host SitePrefix ==== ====== domain1.com D001 domain2.com D002 </pre> <p>In your <code>web.config</code>:</p> <p> </p> <p>In your application's <code>Application_Start</code> event in <code>Global.asax.cs</code> initialise an application wide value:</p> <pre><code>void Application_Start(object sender, EventArgs e) { // Code that runs on application startup string httpHost = HttpContext.Current.Request.ServerVariables["HTTP_HOST"]; Application["SitePrefix"] = GetSiteKeyFromDb(httpHost); } </code></pre> <p>This value will be available across the whole application but unique to the site.</p> <p>When you need to read a setting that is specific to the site:</p> <pre><code>string siteSetting = ConfigurationManager.AppSettings[ HttpContext.Current.Application["SitePrefix"] + "_Setting1" ]; </code></pre> <p>But if you're hitting the database in <code>Application_Start</code> then it may actually be expedient to store all these site specific settings in the database then read and cache them in <code>Application</code> instead of using <code><appSettings /></code>.</p>

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