多个<asp:text>标签间调整间距？

如图，我想让每一行之间都有间隔。

代码：

用户名： /asp:TextBox ErrorMessage="* 必填项">/asp:RequiredFieldValidator 密  码： /asp:TextBox ErrorMessage="* 必填项">/asp:RequiredFieldValidator 验证码： /asp:TextBox /asp:Label &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp   OnClick="ImageButton1_Click" />   onclick="ImageButton3_Click" />

代码贴错了，，

style="margin-left: 165px; margin-right: 165px; height: 500px;">

        <td align="center" style="margin-left: 270px;width: 500px; color: #000000; height: 400px" valign="top" class="txt">
            <table cellpadding="0" cellspacing="0" width="600" style="margin-right: 270px;">
                <tr>
                    <td align="center" height="28"  width="600"></td>
                </tr>
                <tr>
<td class="style1"align="right">用户名</td><td>
                <asp:TextBox ID="name" runat="server"></asp:TextBox>
                <asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" 
                    ErrorMessage="RequiredFieldValidator" ControlToValidate="name" Visible="False"></asp:RequiredFieldValidator>
                <asp:Label ID="Label1" runat="server" Text=""></asp:Label>
                </td>
</tr>
<tr>
<td class="style1"align="right">密码</td><td>
                <asp:TextBox ID="pad1" runat="server" TextMode="Password"></asp:TextBox>
                <asp:RequiredFieldValidator ID="RequiredFieldValidator2" runat="server" 
                    ErrorMessage="RequiredFieldValidator" ControlToValidate="pad1" Visible="False"></asp:RequiredFieldValidator>
                </td>
</tr>
<tr>
<td class="style1"align="right">确认密码</td><td>
                <asp:TextBox ID="psd2" runat="server" TextMode="Password"></asp:TextBox>
                <asp:CompareValidator ID="CompareValidator1" runat="server" 
                    ErrorMessage="CompareValidator" ControlToCompare="pad1" 
                    ControlToValidate="psd2" Visible="False"></asp:CompareValidator>
                </td>
</tr>
<tr>
<td class="style1"align="right">邮箱</td><td>
                <asp:TextBox ID="email" runat="server"></asp:TextBox>
                <asp:RegularExpressionValidator ID="RegularExpressionValidator1" runat="server" 
                    ErrorMessage="RegularExpressionValidator" 
                    ValidationExpression="\w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*" 
                    ControlToValidate="email"></asp:RegularExpressionValidator>
                </td>
</tr>
<tr>
<td class="style1"align="right">性别</td><td>
                <asp:RadioButtonList ID="sex" runat="server" RepeatDirection="Horizontal">
                    <asp:ListItem>女</asp:ListItem><asp:ListItem>男</asp:ListItem>

                </asp:RadioButtonList>
                </td>
</tr>
 <tr>
<td class="style1"align="right">年龄</td><td>
                <asp:TextBox ID="age" runat="server"></asp:TextBox>
                <asp:RangeValidator ID="RangeValidator1" runat="server" 
                    ErrorMessage="RangeValidator" MaximumValue="120" MinimumValue="0" 
                    Visible="False" ControlToValidate="age"></asp:RangeValidator>
                </td>
</tr>
  <tr>
<td class="style1"></td>
<td valign="middle">
<a href="ulogon.aspx">去登录</a>
  &nbsp&nbsp&nbsp&nbsp&nbsp&nbsp
 <asp:Button ID="Button1" runat="server" onclick="Button1_Click" Text="注册" 
        BackColor="#FFCC66" ForeColor="#0033CC" />


 </td>
</tr>

            </table>
            <table cellpadding="0" cellspacing="0" style="color: #000000" width="10">

            </table>

给样式 style1 加上足够的高度，就能把行撑高，等于就有间距了。