How would I go about "logging off" ?
By using a form instead of an anchor:
<li>
@using (Html.BeginForm("LogOff", "Account"))
{
@Html.AntiForgeryToken()
<button type="submit">Logout</button>
}
</li>
You could call the CSS wizards to style this button look like an anchor if you want. But the semantically correct element in this case is an html form which allows you to send a POST verb.