#96 Error:UnitTest.Web.householdTest.TestAdd : page form element

[offo]

If the aspx.cs was inherited from System.Web.UI.Page,
everything was right.
But if the aspx.cs was inherited from class PageBase
that inherited from System.Web.UI.Page, i got error:
---------------------
UnitTest.Web.mypageTest.TestAdd : page form elements
expected:<1>
but was:<0>
---------------------

Here is PageBase.cs

using System;
using System.Web;

namespace myWeb
{
public class PageBase : System.Web.UI.Page
{
public PageBase()
{
}

protected override void OnLoad
(EventArgs e)
{
if (!Users.IsLogin())
{
Go2Login();
}

string cssLink = "<link
href=\"css\\main.css\" type=\"text/css\"
rel=\"stylesheet\">\n";
Response.Write(cssLink);

base.OnLoad(e);
}

private void Go2Login()
{
string strScript = "";
strScript += "<script
language=\"javascript\">\n";
strScript += "confirm(\"please
login\");\n";
strScript
+= "top.location.href = \"login.aspx\";\n";
strScript += "</script>";
Response.Write(strScript);
Response.End();
}
}
}