Writing changes to app.config appSettings section at runtime

That happens because you run it everytime from your solution. try executing the exe, it would work the way you expect it to

The code that I am using is shown below. It does work properly however I run it. I had forgotten that the app.config file that would be modified was the vshost.exe.config file when running inside VS. I was checking the wrong file when looking to see if the change has been made. Even though it works, please let me know if I am doing something that I should not be doing in this code. It allows me to edit the appSettings section of the exe.config file.

      public void UpdateAppSettings(
         string settingName,
         string settingValue)
      {
         Configuration config = ConfigurationManager.OpenExeConfiguration(
            ConfigurationUserLevel.None);
         AppSettingsSection appSettings = config.AppSettings;
         KeyValueConfigurationElement setting =
            appSettings.Settings[settingName];
         setting.Value = settingValue;
         config.Save(ConfigurationSaveMode.Modified);
         ConfigurationManager.RefreshSection("appSettings");
      }