xxx.Entities.User user = new xxx.Entities.User();
            user.AgentLastName = usrDt.Rows[0]["UsrLnm"].ToString();
            user.AgentName = usrDt.Rows[0]["UsrNam"].ToString();
            user.CustomerDescription = usrDt.Rows[0]["CusDes"].ToString();
            user.Id = Convert.ToDecimal(usrDt.Rows[0]["UsrOwnId"]);
            string typ = usrDt.Rows[0]["CusTyp"].ToString();
            if (typ == "C")
            {
                user.Type = xxx.Entities.User.UserType.Customer;
            }
            else if (typ == "A")
            {
                user.Type = xxx.Entities.User.UserType.Agent;
            }
            else
            {
                user.Type = xxx.Entities.User.UserType.None;
            }
            
            user.Key = usrDt.Rows[0]["UsrKey"].ToString();

            // Creo il formatter adeguato           

            BinaryFormatter formatter = new BinaryFormatter();

            // Apro in scrittura un nuovo file o lo sovrascrive 
            using (FileStream file = new FileStream("c:/licence.xml", FileMode.Create, FileAccess.Write))
            {
                // Effettuo la serializzazione 
                formatter.Serialize(file, user);
            }

            Utility.alert_message("Licenza creata con successo!", this.Page);