inherited class is not found

hi!

can somebody help me?

I use asp.net 1.1 (that's requirements) to create new website. I stuck with the following code.

I created template such as:
using System;
using System.Web;
using System.Web.UI;

namespace Moft
{ public class BasePage2 : System.Web.UI.Page
{ private string pageTitle;
...}

// Base Control Class to Enable Access to Page Properties.
public class page_template : System.Web.UI.UserControl
{ public new BasePage2 Page { get { return (BasePage2)base.Page; } } }
}

I try to create pages using template:
default.aspx:

<%@ Page language="C#" Src="Default.aspx.cs" AutoEventWireup="false" Inherits="MainPage" %>
<table valign="middle" height="100%" width="100%">
...

Default.aspx.cs:

using System;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;

namespace Moft
{ public class MainPage : BasePage2
{ protected Label labelYear;
...

when I run it on localhost, it tells me

Compiler Error Message: CS0246: The type or namespace name 'BasePage2' could not be found (are you missing a using directive or an assembly reference?)

I try not to use dll while working on project. Can somebody tell me why it cannnot find the class that is in the same namespace?