ado,net发送邮件

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;
using System.Text;

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

}
protected void Button1_Click(object sender, EventArgs e)
{
string str_user = this.TextBox1.Text;
string str_lxfs = this.TextBox2.Text;
string str_nr = this.TextBox3.Text;
string sent_body = "姓名：" + str_user + "</br>";
sent_body+="联系方式："+str_lxfs+"</br>";
sent_body += "</br>内容：" + str_nr;
MailMessage mail = new MailMessage("haitaoDoit@163.com", "993887459@qq.com");

mail.SubjectEncoding = Encoding.UTF8;
mail.Subject = "你好"; //设置邮件的主题行
mail.IsBodyHtml = true;//是否允许内容为 HTML 格式
mail.BodyEncoding = Encoding.UTF8;
mail.Body = sent_body;
SmtpClient smtp = new SmtpClient("smtp.163.com");//不同的邮箱smtp不同，网易的是这个

smtp.Credentials = new NetworkCredential("a","b"); //SMTP验证 //"a"代表用户名 "b"代表密码
smtp.Send(mail);
this.Label1.Text = "邮件发送成功";
mail.Attachments.Dispose();//邮件发送完毕，释放对附件的锁定
}
}