title: Save data from Textbox and persist in the next session
body: <p>I would like to save some data from a <code>TextBox</code>. This information is entered by a user.</p>
  
  <p>In my <code>Form_Load</code> event handler I set <code>Button1.Enabled = False</code> and have user input <code>right_serial_code</code> into <code>TextBox1</code>. If the code is correct, <code>Button1</code> is enabled.</p>
  
  <p>If users puts the correct serial code, it should be persisted in the next session. So that next time the program starts, user does not need to re-enter.</p>