ASP.NET -- 邮件发送

protected void Button1_Click(object sender, EventArgs e)
{
string path = Server.MapPath("~/uploadfiles/" + FileUpload1.FileName);//FileUpload1控件
FileUpload1.SaveAs(path);//保存上传的文件
MailMessage mail = new MailMessage();
mail.From = new MailAddress("xxx@qq.com", "发件人");//发件人地址，第二个参数表示发件人，可不要，
mail.To.Add(new MailAddress("xxxx@126.com"));//收件人地址
mail.Priority = MailPriority.High;  //优先级
mail.Subject = "主题-发送时间：" + DateTime.Now;//主题
mail.Body = "<a href='http://www.qq.com'>邮件内容</a>";//发送的正文
mail.IsBodyHtml = true;//是否支持html的
Attachment MsgAttach = new Attachment(path);//获取刚刚上传的文件的地址，
mail.Attachments.Add(MsgAttach);//添加到附件
SmtpClient server = new SmtpClient();//邮箱服务器对象
server.Host = "smtp.qq.com";//服务器主机
server.Credentials = new System.Net.NetworkCredential("pwd", "xxxxxx");//个人账号和密码
server.Send(mail);

//异步发送, 会进入回调函数SendCompletedCallback，来判断发送是否成功

}

protected void Button2_Click(object sender, EventArgs e)
{
try
{
MailMessage mail = new MailMessage();
mail.From = new MailAddress("xxx@qq.com", "发件人");
mail.To.Add(new MailAddress("xxx@126.com"));
mail.Subject = "主题-发送时间:" + DateTime.Now;
mail.Body = "<a href='http://www.qq.com'>邮件内容</a>";
mail.IsBodyHtml = true;

SmtpClient server = new SmtpClient();
server.Host = "smtp.qq.com";
server.Credentials = new System.Net.NetworkCredential("pwd", "xxxxxx");
server.SendCompleted += new SendCompletedEventHandler(SendCompletedCallback);//回调函数
string userState = "测试";
server.EnableSsl = true;
server.SendAsync(mail, userState);
ClientScript.RegisterClientScriptBlock(this.GetType(), "success", "<script>alert('发送成功')</script>");
}
catch(SmtpException ex)
{
ClientScript.RegisterClientScriptBlock(this.GetType(), "fail", "<script>alert('发送失败，原因是："+ex.Message+"')</script>");
}
private static void SendCompletedCallback(object sender, System.ComponentModel.AsyncCompletedEventArgs e)
{

if (e.Cancelled)  //邮件发送被取消
{
}

if (e.Error != null)   //邮件发送失败
{
}

else   //发送成功
{
}

}