public void UpdateUser(Sokoban.DataTypes.User user)
 {
     Client.Store(user);
     Client.Commit();
 }
 public void InsertUser(Sokoban.DataTypes.User user)
 {
     user.Id = (from Sokoban.DataTypes.User u in Client select u).Count() + 1;
     Client.Store(user);
     Client.Commit();
 }