关于Formview控件数据修改后控件变形的问题，在线等！！！

Question

我插入一个表格，里面放置了一个Formview控件，源码如下：
<table border="1" cellpadding="0" cellspacing="0" style="width: 600px; height:500px; margin-left:auto; margin-right:auto; margin-top:20px; border-color:Blue;">
<ItemTemplate>
                            <table border="0" cellpadding="0" cellspacing="10" style="width: 530px; height: 390px">
                                <tr>
                                    <td colspan="2" style="height: 40px; background-color: #aeb1e6">
                                        <strong><span style="font-size: 12pt">系统设置<asp:Label ID="Label1" runat="server"></asp:Label></span></strong></td>
                                </tr>
                                <tr>
                                    <td style="width: 140px;" class="bg2">
                                        网站标题</td>
                                    <td class="bg2">
                                        <asp:TextBox ID="TextBox1" runat="server" Width="340px" Text='<%# Bind("title") %>'></asp:TextBox></td>
                                </tr>
                                <tr>
                                    <td style="width: 140px" class="bg2">
                                        站长名字</td>
                                    <td class="bg2">
                                        <asp:TextBox ID="TextBox2" runat="server" Width="340px" Text='<%# Bind("name") %>'></asp:TextBox></td>
                                </tr>
                                <tr>
                                    <td style="width: 140px; height: 21px;" class="bg2">
                                        E-mail</td>
                                    <td style="height: 21px" class="bg2">
                                        <asp:TextBox ID="TextBox3" runat="server" Width="340px" Text='<%# Bind("email") %>'></asp:TextBox></td>
                                </tr>
                                <tr>
                                    <td style="width: 140px" class="bg2">
                                        QQ</td>
                                    <td class="bg2">
                                        <asp:TextBox ID="TextBox4" runat="server" Width="340px" Text='<%# Bind("qq") %>'></asp:TextBox></td>
                                </tr>
                                <tr>
                                    <td style="width: 140px" class="bg2">
                                        默认显示模式</td>
                                    <td class="bg2">
                                        <asp:DropDownList ID="DropDownList1" runat="server" Width="340px">
                                            <asp:ListItem Selected="True" Value="bbs.aspx">ＢＢＳ模式</asp:ListItem>
                                            <asp:ListItem Value="book.aspx">留言本模式</asp:ListItem>
                                            <asp:ListItem Value="news.aspx">留言模式</asp:ListItem>
                                        </asp:DropDownList></td>
                                </tr>
                                <tr>
                                    <td style="width: 140px" class="bg2">
                                        留言本模式显示条目</td>
                                    <td class="bg2">
                                        <asp:TextBox ID="TextBox6" runat="server" Width="340px" Text='<%# Bind("booknum") %>'></asp:TextBox></td>
                                </tr>
                                <tr>
                                    <td style="width: 140px" class="bg2">
                                        论坛模式显示条目</td>
                                    <td class="bg2">
                                        <asp:TextBox ID="TextBox7" runat="server" Width="340px" Text='<%# Bind("bbsnum") %>'></asp:TextBox></td>
                                </tr>
                                <tr>
                                    <td style="width: 140px" class="bg2">
                                        后台管理显示条目</td>
                                    <td class="bg2">
                                        <asp:TextBox ID="TextBox8" runat="server" Width="340px" Text='<%# Bind("adminnum") %>'></asp:TextBox></td>
                                </tr>
                                <tr>
                                    <td style="width: 140px" class="bg2">
                                        广告图片体积</td>
                                    <td class="bg2">
                                        <asp:TextBox ID="TextBox9" runat="server" Width="340px" Text='<%# Bind("adcut") %>'></asp:TextBox></td>
                                </tr>
                                <tr>
                                    <td style="height: 30px; background-color: #aeb1e6" colspan="2">
                                        <asp:Button ID="Button1" runat="server" Text="更新" OnClick="Button1_Click" /></td>
                                </tr>
                            </table>
                        </ItemTemplate>
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本来表格是在页面中间的，但是点击更新后控件内容全部都到了页面左边，应该怎么控制啊？