Processing lines in a TextBox

Below is a simple example of processing all lines in a TextBox:

    public static void WriteFile(string path, string contents)
    {
      using (StreamWriter w = new StreamWriter(path))
        w.Write(contents);
    }

    public static void LineByLine(TextReader reader)
    {
      Console.WriteLine("input type = " + reader.GetType());

      int n = 1;
      string line;
      while ((line = reader.ReadLine()) != null)
        Console.WriteLine(n++ + ". [" + line + "]");
    }

    static void Main(string[] args)
    {
      string text =
        "The quick\n" +
        "brown fox jumped over\n" +
        "the lazy dog.";

      string path = "foo.txt";
      WriteFile(path, text);
      using (StreamReader streamr = new StreamReader(path))
        LineByLine(streamr);

      TextBox textbox = new TextBox();
      textbox.Text = text;
      using (StringReader stringr = new StringReader(textbox.Text))
        LineByLine(stringr);
    }