i'm building a site for course project in Web forms asp.net and i did a master page for all the website i want to have a text box that acts as a search in the website but it needs to be in
<form runat="server">
this is master code
<html>
<div id="topContent">
<head runat="server">
<form runat="server">
<script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.min.js"></script>
<asp:ContentPlaceHolder ID="head" runat="server"></asp:ContentPlaceHolder>
<title>Dor Lugasi Guitar Shop</title>
<link href="Styles.css" rel="stylesheet" type="text/css" />
<right>
<img src="../Images/logobk2.png" alt="Powered by DLG!" class="auto-style7"/><br />
<center id="headdiv">
<asp:LinkButton ID="lnkHome" runat="server" PostBackUrl="~/Pages/Home.aspx" >Home</asp:LinkButton>
<asp:LinkButton ID="lnkLogin" runat="server" PostBackUrl="~/Pages/Login.aspx">Login</asp:LinkButton>
<asp:LinkButton ID="lnkContact" runat="server" PostBackUrl="~/Pages/Contact.aspx" >Contact</asp:LinkButton>
<asp:LinkButton ID="lnkGuitarLab" runat="server" PostBackUrl="~/Pages/GuitarLab.aspx">Guitar Lab</asp:LinkButton>
<asp:ImageButton style="float:left;margin-left:10px;" ID="btnCart" runat="server" Height="55px" ImageUrl="~/Images/cart.png" Width="55px" PostBackUrl="~/Pages/Cart.aspx" />
<asp:TextBox ID="txtSearch" runat="server" BackColor="Silver" BorderColor="Black" TextMode="Search" placeholder=" Search" onkeypress="txtSearch"></asp:TextBox>
<asp:ImageButton ID="btnSearch" runat="server" ImageUrl="~/Images/src.png" OnClick="btnSearch_Click" Width="25px" />
</center>
<center id="headdiv" class="auto-style6">
<asp:Label style="float:left;margin-left:10px;" ID="lblLoggedUser" runat="server" Font-Bold="True" Font-Size="Large" ForeColor="Red"></asp:Label>
<asp:LinkButton ID="btnLogOut" runat="server" OnClick="btnLogOut_Click" Visible="False" CssClass="auto-style5" Height="24px" Width="99px">Log Out</asp:LinkButton>
<asp:LinkButton style="float:right;margin-right:10px;" ID="lnkManageProducts" runat="server" PostBackUrl="~/Pages/ManageProducts.aspx">Manage Products</asp:LinkButton>
<asp:LinkButton style="float:right;margin-right:10px;" ID="lnkManageUsers" runat="server" PostBackUrl="~/Pages/ManageUsers.aspx">Manage Users</asp:LinkButton>
</center>
</form>
</head>
</div>
<body id="body">
<form runat="server">
<center>
<asp:contentplaceholder id="ContentPlaceHolder1" runat="server">
</asp:contentplaceholder>
</center>
<footer id="footer" class="auto-style3">
</left>
<img src="../Images/logowhite.png" alt="Powered by ASP.NET!" />
</footer>
</form>
</body>
</html>
but im getting a:
A page can have only one server-side Form tag.
before i added this search textbox and button i had
<form runat="server">
<html>
...
<head>.....</head>
<body>....</body>
<footer>.....</footer>
</html>
</form>
and it worked but at the login page when i pressed Enter it applied to the search form instead of the login form
eventually i ended up making a single form for the page and just put the specific form that had buttons in
i hope thats the right way