public int Add_UsersDAL(User u)
 {
     try
     {
         using (var orr = new Online_Railway_reservation_systemEntities())
         {
             orr.Configuration.ProxyCreationEnabled = false;
             orr.Add_Users(u.Username, u.Password, u.Email, u.Phone_Number, u.Gender, u.Security_Code, u.Role_ID);
             return 1;
         }
     }
     catch (Exception)
     {
         return 0;
     }
 }