ASP.NET发送电子邮件代码

<table align="center" border="0" cellpadding="4" cellspacing="1" width="600" bgcolor="#cccccc">
                        <tr>
                            <td colspan="2" bgcolor="#f0f0f0" align="center">
                                电子邮件发送测试程序</td>
                        </tr>
                        <tr>
                            <td bgcolor="#f0f0f0" align="right" width="150">发送人：</td>
                            <td bgcolor="#ffffff" align="left"><asp:TextBox ID="fromMail" runat="server" Width="300" /></td>
                        </tr>
                        <tr>
                            <td bgcolor="#f0f0f0" align="right">收件人：</td>
                            <td bgcolor="#ffffff" align="left"><asp:TextBox ID="toMail" runat="server" Width="300" /></td>
                        </tr>
                        <tr>
                            <td bgcolor="#f0f0f0" align="right">抄送人：</td>
                            <td bgcolor="#ffffff" align="left"><asp:TextBox ID="ccMail" runat="server" Width="300" /></td>
                        </tr>
                        <tr>
                            <td bgcolor="#f0f0f0" align="right">暗送人：</td>
                            <td bgcolor="#ffffff" align="left"><asp:TextBox ID="bccMail" runat="server" Width="300" /></td>
                        </tr>
                        <tr>
                            <td bgcolor="#f0f0f0" align="right">主&nbsp;&nbsp;&nbsp;&nbsp;题：</td>
                            <td bgcolor="#ffffff" align="left"><asp:TextBox ID="subject" runat="server" Width="300" /></td>
                        </tr>
                        <tr>
                            <td bgcolor="#f0f0f0" align="right">附&nbsp;&nbsp;&nbsp;&nbsp;件：</td>
                            <td bgcolor="#ffffff" align="left"><input type="file" id="upfile" runat="server" /></td>
                        </tr>
                        <tr>
                            <td bgcolor="#f0f0f0" align="right">内&nbsp;&nbsp;&nbsp;&nbsp;容：</td>
                            <td bgcolor="#ffffff" align="left"><asp:TextBox ID="body" TextMode="multiLine" runat="server" Width="300" Height="200" /></td>
                        </tr>
                        <tr>
                            <td bgcolor="#f0f0f0" align="right">格&nbsp;&nbsp;&nbsp;&nbsp;式：</td>
                            <td bgcolor="#ffffff" align="left"><asp:RadioButtonList ID="format" runat="server"/>
    <asp:Button ID="bt" runat="server" Text="确定发送" OnClick="bt_Click" /></td>
                        </tr>
                    </table>

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post.aspx.cs

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using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

using System.Collections.Generic;
using System.Text;
//using System.Net.Mail;
//using System.Net;

using System.Web.Util;
using System.Web.Mail;

public partial class BookPost : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }
    protected void bt_Click(object sender, EventArgs e)
    {
        bool flag = SendMail(fromMail.Text, toMail.Text, ccMail.Text, bccMail.Text, subject.Text, body.Text, format.SelectedValue);

        if (flag == true)
        {
            Response.Write("<script>alert('发送成功!');</script>");
        }
        else
        {
            Response.Write("<script>alert('发送失败!');</script>");
        }

    }
   
    private bool SendMail(string fromMail, string toMail, string ccMail, string bccMail, string subject, string body, string sendMode)
    {
        try
        {
            MailMessage myMail = new MailMessage();

            myMail.From = fromMail;
            myMail.To = fromMail;
            myMail.Cc = ccMail;
            myMail.Bcc = bccMail;
            myMail.Subject = subject;
            myMail.Body = body;
            myMail.BodyFormat = sendMode == "0" ? MailFormat.Text : MailFormat.Html;

            //附件
            string ServerFileName = "";
            if (this.upfile.PostedFile.ContentLength != 0)
            {
                string upFileName = this.upfile.PostedFile.FileName;
                string[] strTemp = upFileName.Split('.');
                string upFileExp = strTemp[strTemp.Length - 1].ToString();
                ServerFileName = Server.MapPath(DateTime.Now.ToString("yyyyMMddhhmmss") + "." + upFileExp);
                this.upfile.PostedFile.SaveAs(ServerFileName);
                myMail.Attachments.Add(new MailAttachment(ServerFileName));
            }

            myMail.Fields.Add("http://schemas.microsoft.com/cdo/configuration/smtpauthenticate", 1);
            myMail.Fields.Add("http://schemas.microsoft.com/cdo/configuration/sendusername", "huangxinxin"); //发送方邮件帐户
            myMail.Fields.Add("http://schemas.microsoft.com/cdo/configuration/sendpassword", "huangxinxin"); //发送方邮件密码

            SmtpMail.SmtpServer = "smtp." + fromMail.Substring(fromMail.IndexOf("@") + 1);
            SmtpMail.Send(myMail);

            return true;
        }
        catch
        {
            return false;
        }
    }