Правильно ли я добавлять в 2-ой словарь?

public class Users {
    public Dictionary < ulong, Dictionary < string, string >> CachePlayer;
    public Users Default() {
        CachePlayer = new Dictionary < ulong, Dictionary < string, string >> ();
        return this;
    }
}

Добавление:

public static CFG.Users Users = new CFG.Users();
DC4_CORE.Loader.Users.CachePlayer.Add(player.Uid);
DC4_CORE.Loader.Users.CachePlayer[player.Uid].Add("Username", player.Name);
DC4_CORE.Loader.Users.CachePlayer[player.Uid].Add("Ip", player.Ip);
DC4_CORE.Loader.Users.CachePlayer[player.Uid].Add("Health", player.Health.ToString());
DC4_CORE.Loader.Users.CachePlayer[player.Uid].Add("TimeOnline", player.TimeOnline.ToString());