Code:
MySettings.Default.Reload();
            string str = MySettings.Default.SaveClick_ModifReponse;

            XmlDocument xmlDoc = new XmlDocument();
            string path = ConfigurationManager.AppSettings["path"];
            XmlNodeList girlReponse = xmlDoc.GetElementsByTagName("Reponse");
            XmlNodeList girlLib = xmlDoc.GetElementsByTagName("Libelle_Reponse");
...