Changing the username for a logged on user with FormsAuthentication
<p>I'm using FormsAuthentication in my ASP.NET application (not the whole asp.net membership).</p>

<p>When a user logs on I validate against the database and use the following code to create an authentication cookie:</p>

<pre><code>FormsAuthentication.RedirectFromLoginPage(txtUsername.Text, RememberMe.Checked);
</code></pre>

<p>My question is, how do I handle a user changing their username?  As the cookie has a different username, my application crashes. </p>

<p>Can I modify the authentication token, or do I just log the user out?</p>
