GridView固定表头(不用javascript只用CSS)?

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>GridView固定表头 </title>
        <style>
.Freezing
   {

   position:relative ;
   table-layout:fixed;
   top:expression(this.offsetParent.scrollTop);
   z-index: 10;
   }
.Freezing th{text-overflow:ellipsis;overflow:hidden;white-space: nowrap;padding:2px;}
</style>
</head>
<body style="font-size=12px">
    <form >

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