ASP.NET 邮件发送 System.Net.Mail

• 前台页面 SendEmail.aspx 代码
 1     <h2>
 2         发送电子邮件演示
 3     </h2>
 4     <table cellpadding="0" cellspacing="0" border="0" style="font-family: 宋体, Arial, Helvetica, sans-serif;
 5         font-size: 15px; width: 411px;">
 6         <tr>
 7             <td class="style5">
 8                 邮箱地址：
 9             </td>
10             <td class="style6">
11                 <asp:TextBox ID="tb_Email" runat="server" Width="269px"></asp:TextBox>
12             </td>
13         </tr>
14         <tr>
15             <td class="style5">
16                 抄送至：
17             </td>
18             <td class="style6">
19                 <asp:TextBox ID="tb_cc" runat="server" Width="268px"></asp:TextBox>
20             </td>
21         </tr>
22         <tr>
23             <td class="style5">
24                 邮件主题：
25             </td>
26             <td class="style6">
27                 <asp:TextBox ID="tb_Subject" runat="server" Width="268px"></asp:TextBox>
28             </td>