Write values in app.config file

Question

can anyone please help me how can I set/store values in the app.config file using c#, is it possible at all?

Answer 1

//if you want change
Configuration config = ConfigurationManager.OpenExeConfiguration(Application.ExecutablePath);
config.AppSettings.Settings[key].Value = value;

//if you want add
Configuration config = ConfigurationManager.OpenExeConfiguration(Application.ExecutablePath);
config.AppSettings.Settings.Add("key", value);