Save Data Unity

DataSave.cs

    public void SaveTransactions(){
        FileStream file = File.Create(Application.persistentDataPath + "/needItData.dat");
        TransactionData transactionData = new TransactionData(amount, transactions);
        BinaryFormatter bf = new BinaryFormatter();
        bf.Serialize(file, transactionData);
        file.Close();
    }
    
     public void LoadTransactions(){

        if (File.Exists(Application.persistentDataPath + "/needItData.dat"))
        {
            BinaryFormatter binaryFormatter = new BinaryFormatter();
            FileStream file = File.Open(Application.persistentDataPath + "/needItData.dat", FileMode.Open);
            TransactionData data = binaryFormatter.Deserialize(file) as TransactionData;
            file.Close();
            transactions = data.transactions;

            amount = data.amount;
            transactions = data.transactions;

        }
    }
    
    [Serializable]
    class TransactionData
    {
        public double amount;
        public List<Transaction> transactions = new List<Transaction>();
        public TransactionData(double amount, List<Transaction> transactions){
            this.amount = amount;
            this.transactions = transactions;
        }
    }