public PlayerData(MyCities city)
{
cityID = city.cityID;
cityName = city.cityName;
cityPop = city.cityPop;
cityArea = city.cityArea;
}
public static void SaveMyCities(MyCities city)
{
BinaryFormatter formatter = new BinaryFormatter();
string path = "D:/mycities.save";
FileStream stream = new FileStream(path, FileMode.Create);
PlayerData data = new PlayerData(city);
formatter.Serialize(stream, data);
stream.Close();
}