title: How to make a code run on all aspx pages?
body: <p>I need to create a code that reads the <code>QueryString</code> and set a value on the <code>Session</code> and on the end of the page I need to clear the <code>Session</code>.</p>
  
  <p>How can I make a code like this to run on all <code>.aspx</code> pages?</p>