C# ASPX .NET2: A page can have only one server-side Form tag.

[StevenT]

I have searched everywhere and found a lot of information on this but nothing that can fix my problem.

This is my shopping cart HTML, I eventually realised I dont need a form tag here because I have one over my entire masterpage. However when I click on the first button "Update" it works fine. But when I try to redirect from this page with "Proceed To Checkout", which Posts Back to another page I get the error.

"A page can have only one server-side Form tag. "

I don't have any form tags on either of these pages I have double checked.

<asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1" runat="Server">
    <div id="content-a">
            <h1>
                Your Shopping Cart</h1>
            <asp:Label ID="Label1" runat="server" Text="Label"></asp:Label>
            <asp:Table ID="cart" runat="server" Height="55px" Width="543px">
            </asp:Table>
            &nbsp;
            <p style="text-align: right">
                &nbsp; &nbsp;&nbsp;
                <asp:Button ID="btnUpdate" runat="server" Text="Update"  />
                <!--  <input id="btnUpdate"type="submit" value="Update"  />  -->
                &nbsp; &nbsp; &nbsp;
            </p>
 
            <asp:Label ID="lbTotalHd" runat="server" Font-Bold="True" Text="Total:"></asp:Label>
            <asp:TextBox ID="tbTotal" runat="server" BackColor="Transparent" BorderStyle="None"></asp:TextBox>
            <asp:Button ID="btnProceed2" runat="server" Text="Proceed To Checkout" PostBackUrl="ProcessCard.aspx" />
            <!--  <input id="btnProceed" runat="server" type="submit" value="Proceed" />  -->
    </div>
</asp:Content>

[Munawar]

Hi,
Your master page has only one form tag and the content page has no form tag, Thats fine but the page you are redirecting to(checkout page) seems having more than one form tag.
Kindly double check the page you are redirecting to for form tags.

Even if you have more than one Form tag on an ASP.Net page it should work
<form id="form1">
<form id="form2">

but it would not work if the tags are with property "runat" set to server, as follows:
<form id="form1" runat ="server">
<form id="form2" runat ="server">

Hope it would help you.
Thanks