title: Response cookie not updating
body: <p>When I log I create the following cookie:</p>
  
  <pre><code>HttpCookie cookie = new HttpCookie("Ortund");
  // insert cookie values
  cookie.Expires = DateTime.Now.AddMonths(1);
  Response.Cookies.Add(cookie);
  </code></pre>
  
  <p>When I request data from this cookie, I use Request.Cookies:</p>
  
  <pre><code>string username = Convert.ToString(Request.Cookies["Ortund"]["Username"]);
  </code></pre>
  
  <p>When i log out, I do this:</p>
  
  <pre><code>HttpCookie cookie = new HttpCookie("Ortund");
  cookie.Expires = DateTime.Now.AddMonths(-1);
  Response.Cookies.Add(cookie);
  </code></pre>
  
  <p>For some reason, now I'm sitting with a cookie that has an expiry date of <code>0001-01-01 12:00:00 AM</code> in <em>Request.Cookies["Ortund"]</em> and the expiry date of the cookie doesn't change no matter how many times I log in.</p>
  
  <p>Have I done something wrong here? Is this even close to how it should be done?</p>