HTML如下 

代码如下：

<tr> 
<td class="leftTd" style="width: 107px">附加金额</td> 
<td style="width: 315px"><asp:TextBox ID="txtExtendMoney" Text="0" runat="server"></asp:TextBox> 
<asp:RegularExpressionValidator ID="regExtend" runat="server" ControlToValidate="txtExtendMoney" Display="Dynamic" ErrorMessage="格式不正确" ValidationExpression="[1-9]d*.d*|0.d*[1-9]d*|^[1-9]d*|0"></asp:RegularExpressionValidator> 
<asp:RequiredFieldValidator ID="reqExtedNo" runat="server" ControlToValidate="txtExtendMoney" Display="Dynamic" ErrorMessage="不可为空"></asp:RequiredFieldValidator></td> 
<td class="leftTd">结算方式</td> 
<td><asp:DropDownList ID="ddlPayType" runat="server"><asp:ListItem>现金</asp:ListItem><asp:ListItem>银行转账</asp:ListItem></asp:DropDownList></td> 
</tr> 
<tr> 
<td class="leftTd">结算账户</td> 
<td colspan="3"><asp:RadioButtonList ID="rdbPayAccountBank" runat="server" RepeatLayout="Flow"></asp:RadioButtonList></td> 
</tr> 

最后一个RadioButtonList的ListItem为“其他账户"，当选中时，其后增加相应的asp.net服务器控件。选择其