title: What is the string format of the Asp.net SessionID?
body: <p>I want to use the <code>Session.SessionID</code> as file name and query string in URL. I want to know if its format is suitable for these applications. For example you can not use <code>'?'</code> or <code>'&lt;'</code> characters in a file name.</p>
  
  <p>Is SessionID format string safe for file names and query strings?</p>