How to update an value in app.config file?

Question

This is my code:

Configuration configuration = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
KeyValueConfigurationCollection settin         


        

Answer 1

This code should work:

Configuration config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);

config.AppSettings.Settings["IP"].Value = "10.0.0.2";
config.Save(ConfigurationSaveMode.Modified);
ConfigurationManager.RefreshSection("appSettings");

Answer 2

As per my knowledge you can't persist the updated value in App.config. If you want to persist the config value,do the normal XML operation.