帮看下哪里错了

本来是想记录下来访者ip的，结果搞半天还是错的，错误“未能在 ControlParameter“ipaddress”中找到控件“_page”。”<%@ Page Language="C#" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><script runat="server">
   public string address
    {
        get { return Request.UserHostAddress; }
     }
</script><html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
<asp:FormView ID="FormView1" runat="server" DataSourceID="SqlDataSource1" EnableModelValidation="True" DefaultMode="Insert">
       <InsertItemTemplate>
          名字：<asp:TextBox ID="TextBox1" Text='<%# Bind("name") %>' runat="server" /><br />
          内容：<asp:TextBox ID="TextBox2" TextMode="MultiLine" Text='<%# Bind("comments") %>' runat="server" />
             <asp:Button ID="Button1" runat="server" Text="提交留言" CommandName="Insert" />
       </InsertItemTemplate>
</asp:FormView>
        <br />
        <br />
        <br />
        <asp:GridView ID="GridView1" runat="server" DataSourceID="SqlDataSource1" 
            EnableModelValidation="True">
        </asp:GridView>
        <br />
        <br />
        <asp:SqlDataSource ID="SqlDataSource1" runat="server" 
            ConflictDetection="CompareAllValues" 
            ConnectionString="<%$ ConnectionStrings:filmConnectionString %>" 
            InsertCommand="insert Guestbook(name,comments,ipaddress) values(@name,@comments,@address)"
            SelectCommand="SELECT * FROM [GuestBook]" >
            <InsertParameters>
                <asp:Parameter Name="name" Type="String" />
                <asp:Parameter Name="comments" Type="String" />
                <asp:ControlParameter Name="ipaddress"  ControlID="_page" PropertyName="address" />
            </InsertParameters>
            </asp:SqlDataSource>
    
    </div>
    </form>
</body>
</html>

解决方案 »

  1.   

     <asp:ControlParameter Name="ids" ControlID = "txtId" Type="String" />
     <asp:TextBox ID="txtId" runat="server"></asp:TextBox>
    _page不存在
      

  2.   

    up  up  up  up 
      

  3.   

     ControlID="_page"，_page是Page类自动生成的ID`````````````````````````````````````````````???
      

  4.   

    <asp:ControlParameter Name="ipaddress" ControlID="__page" 
                    PropertyName="address" />    
      

  5.   

     ControlID="_page"改成ControlID="__page"
      
     
      

  6.   


    我用的是VS2010，靠，如果是__(这个怎么是两_)，就会提示必须声明标量变量 "@IPAdress"。