Control 'c1_t1' of type TextBox must be placed inside a form tag with runat=server in Asp.Net -


i creating shopping website on admin side adding add_product.aspx web form getting error "control 'c1_t1' of type 'textbox' must placed inside form tag runat=server." product page html given below , have master page..

    <%@ page title="" language="c#" masterpagefile="~/admin/admin.master" autoeventwireup="true" codefile="add_product.aspx.cs" inherits="admin_add_product" %>           <asp:content id="content1" contentplaceholderid="c1" runat="server">             <h3>add product page</h3>              <table>                 <tr>                     <td>product name</td>                     <td>                         <asp:textbox id="t1" runat="server"></asp:textbox>                     </td>                 </tr>                  <tr>                     <td>product description</td>                     <td>                         <asp:textbox id="t2" runat="server"></asp:textbox>                     </td>                 </tr>                  <tr>                     <td>product price</td>                     <td>                         <asp:textbox id="t3" runat="server"></asp:textbox>                     </td>                 </tr>                  <tr>                     <td>product qty</td>                     <td>                         <asp:textbox id="t4" runat="server"></asp:textbox>                     </td>                 </tr>                  <tr>                     <td>product image</td>                     <td>                         <asp:fileupload id="fileuploadimageuploader" runat="server" />                     </td>                 </tr>                  <tr>                     <td colspan="2">                         <asp:button id="btnupload" runat="server" text="upload" onclick="btnupload_click" />                     </td>                 </tr>             </table>         </asp:content>

it have master page , adding master page code below

<%@ master language="c#" autoeventwireup="true" codefile="admin.master.cs" inherits="admin_admin" %>  <!doctype html> <html xmlns="http://www.w3.org/1999/xhtml"> <head>     <meta charset="utf-8" />     <meta name="viewport" content="width=device-width, initial-scale=1.0" />     <title>simple responsive admin</title>     <!-- bootstrap styles-->     <link href="assets/css/bootstrap.css" rel="stylesheet" />     <!-- fontawesome styles-->     <link href="assets/css/font-awesome.css" rel="stylesheet" />     <!-- custom styles-->     <link href="assets/css/custom.css" rel="stylesheet" />     <!-- google fonts-->     <link href='http://fonts.googleapis.com/css?family=open+sans' rel='stylesheet' type='text/css' /> </head> <body>     <form>         <div id="wrapper">             <div class="navbar navbar-inverse navbar-fixed-top">                 <div class="adjust-nav">                     <div class="navbar-header">                         <button type="button" class="navbar-toggle" data-toggle="collapse" data-target=".sidebar-collapse">                             <span class="icon-bar"></span>                             <span class="icon-bar"></span>                             <span class="icon-bar"></span>                         </button>                         <a class="navbar-brand" href="#">                             <img src="assets/img/logo.png" />                          </a>                      </div>                      <span class="logout-spn">                         <a href="#" style="color: #fff;">logout</a>                      </span>                 </div>             </div>             <!-- /. nav top  -->             <nav class="navbar-default navbar-side" role="navigation">                 <div class="sidebar-collapse">                     <ul class="nav" id="main-menu">                            <li class="active-link">                             <a href="index.html"><i class="fa fa-desktop "></i>dashboard <span class="badge">included</span></a>                         </li>                           <li>                             <a href="ui.html"><i class="fa fa-table "></i>ui elements  <span class="badge">included</span></a>                         </li>                         <li>                             <a href="blank.html"><i class="fa fa-edit "></i>blank page  <span class="badge">included</span></a>                         </li>                           <li>                             <a href="#"><i class="fa fa-qrcode "></i>my link one</a>                         </li>                         <li>                             <a href="#"><i class="fa fa-bar-chart-o"></i>my link two</a>                         </li>                          <li>                             <a href="#"><i class="fa fa-edit "></i>my link 3 </a>                         </li>                         <li>                             <a href="#"><i class="fa fa-table "></i>my link four</a>                         </li>                         <li>                             <a href="#"><i class="fa fa-edit "></i>my link 5 </a>                         </li>                      </ul>                 </div>              </nav>             <!-- /. nav side  -->             <div id="page-wrapper">                 <div id="page-inner">                     <div class="row">                         <div class="col-lg-12">                             <h2>admin dashboard</h2>                         </div>                     </div>                     <!-- /. row  -->                     <hr />                      <!-- /. row  -->                     <!--this content area -->                     <asp:contentplaceholder id="c1" runat="server">                      </asp:contentplaceholder>                  </div>             </div>             <!-- /. row  -->             <div class="row">                 <div class="col-lg-12 ">                     <br />                     <div class="alert alert-danger">                         <strong>want more icons free ? </strong>checkout fontawesome website , use icon <a target="_blank" href="http://fortawesome.github.io/font-awesome/icons/">click here</a>.                     </div>                  </div>             </div>             <!-- /. row  -->         </div>      <div class="footer">           <div class="row">             <div class="col-lg-12">                 &copy;  2014 yourdomain.com | design by: <a href="http://binarytheme.com" style="color: #fff;" target="_blank">www.binarytheme.com</a>             </div>         </div>     </div>           <!-- /. wrapper  -->         <!-- scripts -at botom reduce load time-->         <!-- jquery scripts -->         <script src="assets/js/jquery-1.10.2.js"></script>         <!-- bootstrap scripts -->         <script src="assets/js/bootstrap.min.js"></script>         <!-- custom scripts -->         <script src="assets/js/custom.js"></script>      </form> </body> </html>

as error states:

"control 'c1_t1' of type 'textbox' must placed inside form tag runat=server."

and form element is:

<form>

the error telling want do. form element needs runat="server":

<form runat="server">

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