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    <p>I came across the same problem, after deep investigation, I found out the easiest way to update any part of config files (e.g. app.config), that's by using XPath. We have an application which connects to web service, during the installation, the user enters the URL of the web service and this should be saved in the following app.config file:</p> <pre><code> &lt;?xml version="1.0"?&gt; &lt;configuration&gt; &lt;configSections&gt; &lt;sectionGroup name="applicationSettings" type="System.Configuration.ApplicationSettingsGroup, System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"&gt; &lt;section name="ApplicationServer.Properties.Settings" type="System.Configuration.ClientSettingsSection, System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" /&gt; &lt;/sectionGroup&gt; &lt;/configSections&gt; &lt;applicationSettings&gt; &lt;ApplicationServer.Properties.Settings&gt; &lt;setting name="ApplicationServer_ApplicationServerUrl" serializeAs="String"&gt; &lt;value&gt;whatever comes from setup should go here&lt;/value&gt; &lt;/setting&gt; &lt;/ApplicationServer.Properties.Settings&gt; &lt;/applicationSettings&gt; &lt;/configuration&gt; </code></pre> <p>Here is the code to do this in the installer class:</p> <pre><code>public override void Install(System.Collections.IDictionary stateSaver) { base.Install(stateSaver); string targetDirectory = Context.Parameters["targetdir"]; string param1 = Context.Parameters["param1"]; string path = System.IO.Path.Combine(targetDirectory, "app.config"); System.Xml.XmlDocument xDoc = new System.Xml.XmlDocument(); xDoc.Load(path); System.Xml.XmlNode node = xDoc.SelectSingleNode("/configuration/applicationSettings/Intellisense.ApplicationServer.Properties.Settings/setting[@name='ApplicationServer_ApplicationServerUrl']/value"); node.InnerText = (param1.EndsWith("/") ? param1 : param1 + "/"); xDoc.Save(path); // saves the web.config file } </code></pre> <p>Basically, since the config file is a XML based document, I am using XPath expression to locate specific node and change its value.</p>
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    1. CO@Khalil Dahab Interesting... Thanks for the suggestion. I'll give it a try soon and report back.
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    2. CO@Khalil Dahab -- I just tried it out. Works great. Thanks again.
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