用了母版页之后找不到内容页的控件咋办

用了母版页之后找不到内容页的控件咋办
<%@ Page Title="" Language="C#" MasterPageFile="~/MasterPage.master" AutoEventWireup="true" CodeFile="contact.aspx.cs" Inherits="contact" %><asp:Content ID="Content1" ContentPlaceHolderID="head" Runat="Server">
<form id="form1" runat="server">
    <div style=" height:40px;">
        <div style=" height:40px; width: 91px; background-image: url('img/p_c.jpg');">
            <input id="Text1" align="middle" 
                style="background-color: transparent; width: 87px; height: 35px;" type="text" 
                value="联系我们" />
          </div>
          <div style=" height:410px; width: 720px;">
              <textarea id="TextArea1"  runat="server" name="TextArea1" style="height: 394px; width: 720px"></textarea></div>
     </div>
 
    </form>
</asp:Content>
怎样找到textarea 控件