Updating config value from the db at application initialization

ConfigReload.cs

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

IDictionary<string, string> staticAppSettings = ConfigService.GetStaticAppSettings(); 

foreach (var setting in staticAppSettings)
{
  if (ConfigurationManager.AppSettings[setting.Key] == null)
    config.AppSettings.Settings.Add(setting.Key, setting.Value);
  else
    ConfigurationManager.AppSettings[setting.Key] = setting.Value; 
}

config.Save();
ConfigurationManager.RefreshSection("appSettings");