class Configuration
    {
        public static string fileName=System.IO.Path.GetFileName(Application.ExecutablePath);
        public static bool addSetting(string key,string value){ 
            Configuration config = System.Configuration.ConfigurationManager.OpenExeConfiguration(fileName);
            config.AppSettings.Settings.Add(key, value);
            config.Save();
            return true;
        }
        public static string getSetting(string key){
            Configuration config = System.Configuration.ConfigurationManager.OpenExeConfiguration(fileName);
            string value=config.AppSettings.Settings[key].Value;
            return value;
        }
        public static bool updateSeeting(string key, string newValue)
        {
            Configuration config = System.Configuration.ConfigurationManager.OpenExeConfiguration(fileName);
            string value = config.AppSettings.Settings[key].Value=newValue;
            config.Save();
            return true;
        }
    }
}