asp为啥取不到request.QueryString的值

<%
dim smallClassName
smallClassName=request.QueryString("SmallClassName")
strFileName="product.asp?smallClassName="& smallClassName

set rsSmallClass=server.CreateObject("adodb.recordset")
rsSmallClass.open "Select * From SmallClass order by Pid desc",conn,1,1
if not(rsSmallClass.bof and rsSmallClass.eof) then
maxrecord=rsSmallClass.recordcount
%>
<div class="main">
<div class="banner">

<div class="bannerLeft">
<a href="product.asp">Products</a>&nbsp;&nbsp;>&nbsp;&nbsp;<a href="product.asp?SmallClassName=<%=smallClassName%>"><%=smallClassName%><!--此处可以获取smallClassName的值--></a>
</div>

<%
do while not rsSmallClass.eof
request.write(smallClassName)<!--此处无法获取smallClassName的值，为嘛？-->
if rsSmallClass("ESmallClassName") = smallClassName then
%>
   <img src="../<%=rsSmallClass("EUploadImgSmall")%>" width="995" />
<%
end if
rsSmallClass.movenext
loop
end if
%>