Hmmm, just ran across something interesting.  Twas trying to publish a precompiled site to a 3rd-party host for the first time, and kept getting: ‘Cannot convert type ‘ASP.login_aspx’ to ‘System.Web.UI.WebControls.Login”  At first I thought perhaps it was a permissions thing, I mean it’s worked fine at my day job when deploying on our networks.

As usual, Google is your friend.  Basically don’t name your pages (or perhaps just your Page classes) the same as controls in (at least) the System.Web namespace(s).  Read there for more info.  Renamed my Login.aspx to XXLogin.aspx and presto!