title: How to prevent a password input from clearing after submit?
body: <p>If you have a page with an <code>&lt;asp:TextBox TextMode="Password" ... /&gt;</code>.<br>
  How can you keep the value after a postback?</p>
  
  <p>This is my problem:<br>
  At the registration screen of my app you need to enter a password. 
  Then you click submit, a postback occurs and the password fields are cleared, how can I prevent the password field from clearing?</p>