C＃索引不在上下文中

Question

I am can't figure out how to put the index [i] in the context when I try to write in to the listbox1. The code I got so far is:

    private void button1_Click(object sender, EventArgs e)
    {            
        StreamWriter Info = File.AppendText("Contacts.txt");

        for (int i = 0; i < listBox1.Items.Count; i++);
            Info.WriteLine(listBox1.Items[i]);
        Info.Close();
    }

I am trying to make a Windows Form application that accepts names and email addresses and places them in a list box. Can anyone help me out on what I am missing here?

Answer 1

The semicolon in this line for (int i = 0; i < listBox1.Items.Count; i++); may cause an error. Delete it and then try again.

Answer 2

I don't know what you are trying to do. I am providing you the possible solutions here as i understood your problem.

1. If you need to write a file with listbox1 contents, same code with correction by Misa Lazovic:

    private void button1_Click(object sender, EventArgs e) { StreamWriter Info = File.AppendText("Contacts.txt"); for (int i = 0; i < listBox1.Items.Count; i++) Info.WriteLine(listBox1.Items[i]); Info.Close(); } 

2. If you need to read the contents from file and place them to your listbox1 :

    private void button1_Click(object sender, EventArgs e) { foreach (string s in System.IO.File.ReadAllLines("Contacts.txt")) listBox1.Items.Add(s); }