How to update the contents of one app.config file from another

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Dear Coders,

I want to update the contents of my app.config file from other config file which is in a shared location. Please help me the coding part of it.

shared.config file

HTML

!appsettings!
!add key="loc1" value="location1"!
!/appsettings!

app.config file

HTML

!appsettings!
!add key="loc" value="location"!
!/appsettings!

now how can i reflect the change of location present in app.config file with the location present in shared.config file ,with button click. Thanks in advance.

Posted 12-Mar-12 21:10pm

rajuchanukya951

Updated 12-Mar-12 23:18pm

Herman<T>.Instance

v2

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Oshtri Deka 13-Mar-12 3:53am

Off-topic, but I must ask, why don't you use xml based config solutions?

Herman<T>.Instance 13-Mar-12 5:32am

have you read this?

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hitech_s · Answer 1 · 2012-04-16T18:45:00

this is the code to update the app.config file.
once you modify the app.config file the changes will reflect if you restart the application
you can call the function like this

SQL

AppSettingsUpdater.UpdateConfigFile("loginid", "newdetails");
                                AppSettingsUpdater.UpdateConfigFile("pwd", newdetails2);

your code should be like this

C#

public class AppSettingsUpdater
   {
       public static void UpdateConfigFile(string key, string value)
       {
           XmlDocument xmlDoc = new XmlDocument();
           xmlDoc.Load(AppDomain.CurrentDomain.SetupInformation.ConfigurationFile);
           foreach (XmlElement element in xmlDoc.DocumentElement)
               if (element.Name == "appSettings")
               {
                   foreach (XmlNode node in element.ChildNodes)
                       if (node.Attributes[0].Value == key)
                           node.Attributes[1].Value = value;
               }
           xmlDoc.Save(AppDomain.CurrentDomain.SetupInformation.ConfigurationFile);
           ConfigurationManager.RefreshSection("appSettings");
       }
   }

your app.config file should be like this

XML

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <appSettings>
    <add key="loginid" value="NODATA"></add>
    <add key="pwd" value="NODATA"></add>
  </appSettings>
</configuration>