ASP.NET 发邮件

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

using System.Net.Mail;
using System.Net;

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

}
protected void Button1_Click(object sender, EventArgs e)
{

MailMessage msg = new MailMessage();
msg.Body = this.TextBox2.Text;
msg.From = new MailAddress("[e-mail]");
msg.Subject = this.TextBox1.Text;
msg.To.Add("[e-mail]");

//SmtpClient sc = new SmtpClient("smtp.126.com", 25);
//SmtpClient sc1 = new SmtpClient("smtp.qq.com",25);
//sc1.Credentials = new NetworkCredential("993887459","asdf");
//sc1.Send(msg);
msg.IsBodyHtml = true; //邮件默认格式是纯文本 //可发送超链接 如：<a href="http://www.baidu.com">百度</a>
SmtpClient sc2 = new SmtpClient();
sc2.Host = "smtp.qq.com";
sc2.Port = 25;
NetworkCredential nc = new NetworkCredential();
nc.UserName = "youxiangming";
nc.Password = "mima";
sc2.Credentials = nc;

string filename = this.FileUpload1.FileName;
this.FileUpload1.SaveAs(Server.MapPath("~/") + filename);
Attachment att = new Attachment(Server.MapPath("~/") + filename);

msg.Attachments.Add(att);

sc2.Send(msg);

}
protected void Button2_Click(object sender, EventArgs e)
{
jmail.Message msg = new jmail.MessageClass();
msg.Subject = this.TextBox1.Text;
msg.Body = this.TextBox2.Text;
msg.From = "[e-mail]";
msg.AddRecipient("[e-mail]");
msg.MailServerUserName = "youxiangming";
msg.MailServerPassWord = "mima";
msg.Charset = "utf-8"; //显示汉字
msg.ContentType = "text/html";
msg.Send("smtp.qq.com");
}
}