后台CS程序如何调用用户控件中的变量?(50分)

关键代码如下:
---------------------------------------
date.ascx:
<%@ Control Language="C#" Inherits="inc_date" src="/inc/date.cs"%>
<aspanel id="panDate" runat="server" Height="27px" Width="283px">
<asp:Label ID="test" runat="server" />
</aspanel>
---------------------------------------
date.cs:
public class inc_date:UserControl
{
public DateTime dtmTdate
{
get
{
return (dtmTdate);
}
set
{
dtmTdate=value;
}
}
... ... ...
}
-------------------------------------------------
test.aspx:
<%@ Register TagPrefix="hPglt" TagName="Tdate" Src="../inc/date.ascx" %>
... ... ... ...
<hPglt:Tdate id="pltDate" runat="server" />
... ... ... ...
-------------------------------------------------
test.cs
... ... ...
protected inc_date pltDate;
... ... ...
总是报"找不到类型或命名空间名称“???”(是否缺少 using 指令或程序集引用？)"

心情郁闷，居然无人应对！　：（