title: User.Identity.IsAuthenticated is false after adding auth cookie
body: <p>I have the following code to add authentication cookie to the response and redirect to homepage</p>
  
  <pre><code>HttpCookie authCookie = FormsAuthentication.GetAuthCookie(username, true);
  Response.Cookies.Add(authCookie);
  Response.Redirect("~/Home/Home.aspx");
  </code></pre>
  
  <p>But in the Home.aspx, <code>User.Identity.IsAuthenticated</code> is still false. why? </p>