saveLoad

public class SaveLoad
{
    public static void Save()
    {
        SaveData currentSave = new SaveData();
        //
        //assign currentSave fields
        //
        BinaryFormatter BF = new BinaryFormatter();
        FileStream FS = File.Open(Application.persistentDataPath + "/SaveData.dat", FileMode.OpenOrCreate);
        BF.Serialize(FS, currentSave);
        FS.Close();
    }
    public static bool Load()
    {
        if (File.Exists(Application.persistentDataPath + "/SaveData.dat"))
        {
            BinaryFormatter BF = new BinaryFormatter();
            FileStream FS = File.Open(Application.persistentDataPath + "/SaveData.dat", FileMode.Open);
            SaveData currentLoad = (SaveData)BF.Deserialize(FS);
            FS.Close();
            //
            //read currentLoad fields
            //
            return true;
        }
        else
        {
            return false;
        }
    }
    [Serializable]
    private class SaveData
    {
        //any serializable fields
    }
}