مبتدی: ذخیره مقادیر property ها در یک فایل متنی

private void toolStripButton1_Click(object sender, EventArgs e)
{
string pth = Path.GetFullPath(@"./") + "Save.txt";
FileStream fs = new FileStream(pth, FileMode.Create);
StreamWriter sw = new StreamWriter(fs);
foreach (Shape shapes in ListOfProperties.Items)
{
shapes.Save(sw);
}
}

public override void Save(StreamWriter sw)
{
sw.WriteLine("{0}.{1}.{2}.{3}.{4}.{5}.{6}", name, strockcolor, strockwidth, x, y, width, height);
}