title: C# - Save the last selected file names after closing DialogBox
body: <p>I have a button which will open a file dialog and choose 2 certificates.<br>
  <a href="https://i.stack.imgur.com/mPjnI.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/mPjnI.png" alt="enter image description here"></a>  After i click the button a windows will be shown from where i choose two certificates.<a href="https://i.stack.imgur.com/7hQDu.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/7hQDu.png" alt="enter image description here"></a></p>
  
  <p>I click Open so i will get this two certs.  What i want to do is that after i click Open and click again the Select Certificate button instead the empty filename textbox like this <a href="https://i.stack.imgur.com/nqFGo.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/nqFGo.png" alt="enter image description here"></a> I want the last selection to be saved.
  Is it possible such a thing?</p>