Problem with creating more than one Panel

I have this code:
in Default.aspx:
    <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox><br />
    <asp:Button ID="Button1" runat="server" Text="Button" onclick="Button1_Click" /><br /><br />
    <table>
    <tr>
    <asp:PlaceHolder ID="PlaceHolder1" runat="server">
    </asp:PlaceHolder>
    </tr>
    </table>



and in Default.aspx.cs:



    protected void Button1_Click(object sender, EventArgs e)

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