Error when casting PreviousPage
<p>I am trying to use PostBackUrl in my default.aspx page to postback to my memberlogin.aspx page. When I try to cast the PreviousPage object to a _Default page object, in the code behind for memberlogin.aspx I get this error:</p>

<p>CS0030: Cannot convert type '_Default' to 'ASP.default_aspx'</p>

<p>Why won't it let me cast it? Without casting it I can't access the default pages properties (I have tried using interfaces too, same problem).</p>
