Change label text parmanently

To persist a value between different runnings of your application, you'll need to save it to disk.

You could either use a simple text file for this or you could use a  'user setting'.

For the former the code would be something like this:

string filePath = Application.StartupPath + "\\mysetting.txt";

// save value to file
System.IO.WriteAllText(filePath, label1.Text);

// read it back

if (System.IO.File.Exists(filePath))
{
    label1.Text = System.IO.File.ReadAllText(filePath);
}
else
{
   label1.Text = "0'; // or whatever
}

Check this link for the latter:

http://msdn.microsoft.com/en-us/library/bb397750(v=vs.110).aspx