title: asp.net variable setted even if EnableSessionState="ReadOnly"
body: <p>I've got a page that have the directive <strong>EnableSessionState="ReadOnly"</strong> setted.</p>
  
  <p>When i have:</p>
  
  <pre><code>this.Session.Add("MyVar","TempVar");
  </code></pre>
  
  <p>the next request returns <strong>NULL</strong>.</p>
  
  <p>When i have:</p>
  
  <pre><code>this.Session["MyVar"] = "TempVar";
  </code></pre>
  
  <p>the next request return <strong>"TempVar"</strong></p>
  
  <p>can i disable this behavior?</p>