问问大家一个写法问题？

Question

一个网页有 header.ascx 、footer.ascx 、register.ascx 三部分是把头、脚 文件都写在Form中 ，还是写在外面好？ 
<book:Header id="Header1" runat="server"></book:Header>
<form id="Form1" method="post" runat="server">     <book:Login id="Login1" runat="server"></book:Login></form>
<book:Footer id="Footer1" runat="server"></book:Footer>
------------------------------------------------------------------------------
<form id="Form1" method="post" runat="server"><book:Header id="Header1" runat="server"></book:Header>
<book:Login id="Login1" runat="server"></book:Login>
<book:Footer id="Footer1" runat="server"></book:Footer></form>