i have some user controls in every aspx page of a site, i got two from tag like:


<form style="PADDING-RIGHT: 0px; PADDING-LEFT: 0px; PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-TOP: 0px" action="advancedsearch.aspx" method="post">
<uc1:siteheader id="SiteHeader1" runat="server"></uc1:siteheader>
</form>
......
<FORM id="ou" runat="server">
<table cellSpacing="0" cellPadding="0" width="100%" border="0">
<TR><TD id="emailpage" vAlign="middle" runat="server"></TD>
......

<P><uc1:vnavbar id="VNavBar1" runat="server"></uc1:vnavbar></P>
...
</from>

Control vnavbar is actually a menu, above code was working fine until i change a new menu control, so I replace <P><uc1:vnavbar id="VNavBar1" runat="server"></uc1:vnavbar></P> with
<uc1:SiteMenu id="SiteMenu" runat="server"></uc1:SiteMenu>, so i was thinking this shouldn't be a problem, i just replace a user control with a different one, some pages were working, but some page got this error said one aspx page can only can one form tag, well, i know that but how can it was working with the old user control, i just replace it, i didnt put any addition <form> tag.

i was googling for days but haven't slove this problem, any expert can help me out here? i am quite new to ASP.net, many thxxxxxx and wish you have a Happy New Year!