Question

Im working on a little ATM program and I’m stuck on a StreamWritter problem.
On load, my program must use a StreamReader to read in 4 .txt files all located in my bin/debug. Then the user is asked to either Deposit or Withdraw money from the bank accounts located in the .txt files. Everything works fine for the StreamReader which loads all the bank accounts on program loading and for the StreamWriter to write the changes in the .txt files when I add/remove money.
My problem is when I close the program, the loading of the files works just fine but I can’t write in the files anymore. My StreamWriter jumps straight to the Catch part and cannot be instantiated. How is that possible if it worked just fine on first use.
Heres the StreamReader Code :

    public bool ReadSavingAccount()
    {
        string strLine;
        string[] strArray;
        char[] charArray = new char[] { ',' };
        FileStream aFile;
        StreamReader sr;
        try
        {
            aFile = new FileStream("mySavingAccount.txt", FileMode.Open);
            sr = new StreamReader(aFile);

            strLine = sr.ReadLine();
            while (strLine != null)
            {
                strArray = strLine.Split(charArray);
                Savings monSave = new Savings(strArray[0], Convert.ToDouble(strArray[1]));
                mySavingAccount.Add(monSave);
                strLine = sr.ReadLine();
            }
            sr.Close();
            aFile.Close();
        }
        catch
        {
            return false;
        }

        return true;
    }

And the StreamWrite Code:

    public bool WriteSavingAccount()
    {
        FileStream aFile;
        StreamWriter sw;
        string myString;

        try
        {
            aFile = new FileStream("mySavingAccount.txt", FileMode.Create);
            sw = new StreamWriter(aFile);
        }
        catch
        {
            return false;
        }

        foreach (Savings mySave in mySavingAccount)
        {
            myString = mySave.AccountNumber + "," + mySave.AccountBalance;
            sw.WriteLine(myString);

        }
        sw.Close();
        return true;
    }

Any idea what the problem could be ?
Thanks in advance and let me know if you need any other parts of the code.

Answer 1

Try adding a second parameter of boolean to your StreamWriter call. This is the append parameter. True to append to the file, false to overwrite it.

sw = new StreamWriter(aFile, false);