求一代码

using System;
using System.Net;
using System.Net.Mail;
using System.Net.Mime;
using System.Threading;
using System.ComponentModel;
namespace Examples.SmptExamples.Async
{
    public class SimpleAsynchronousExample
    {
        static bool mailSent = false;
        public static void SendCompletedCallback(object sender, AsyncCompletedEventArgs e)
        {
            // Get the unique identifier for this asynchronous operation.
             String token = (string) e.UserState;

            if (e.Cancelled)
            {
                 Console.WriteLine("[{0}] Send canceled.", token);
            }
            if (e.Error != null)
            {
                 Console.WriteLine("[{0}] {1}", token, e.Error.ToString());
            } else
            {
                Console.WriteLine("Message sent.");
            }
            mailSent = true;
        }
        public static void Main(string[] args)
        {
            // Command line argument must the the SMTP host.
            SmtpClient client = new SmtpClient(args[0]);
            // Specify the e-mail sender.
            // Create a mailing address that includes a UTF8 character
            // in the display name.
            MailAddress from = new MailAddress("[email protected]",
               "Jane " + (char)0xD8+ " Clayton",
            System.Text.Encoding.UTF8);
            // Set destinations for the e-mail message.
            MailAddress to = new MailAddress("[email protected]");
            // Specify the message content.
            MailMessage message = new MailMessage(from, to);
            message.Body = "This is a test e-mail message sent by an application. ";
            // Include some non-ASCII characters in body and subject.
            string someArrows = new string(new char[] {'\u2190', '\u2191', '\u2192', '\u2193'});
            message.Body += Environment.NewLine + someArrows;
            message.BodyEncoding =  System.Text.Encoding.UTF8;
            message.Subject = "test message 1" + someArrows;
            message.SubjectEncoding = System.Text.Encoding.UTF8;
            // Set the method that is called back when the send operation ends.
            client.SendCompleted += new
            SendCompletedEventHandler(SendCompletedCallback);
            // The userState can be any object that allows your callback
            // method to identify this send operation.
            // For this example, the userToken is a string constant.
            string userState = "test message1";
            client.SendAsync(message, userState);
            Console.WriteLine("Sending message... press c to cancel mail. Press any other key to exit.");
            string answer = Console.ReadLine();
            // If the user canceled the send, and mail hasn't been sent yet,
            // then cancel the pending operation.
            if (answer.StartsWith("c") && mailSent == false)
            {
                client.SendAsyncCancel();
            }
            // Clean up.
            message.Dispose();
            Console.WriteLine("Goodbye.");
        }
    }
}

不过这个是1.1的，参数自定义MailMessage myMail = new MailMessage();
myMail.From = EMAIL_ADDRESS;
myMail.To = strEmail;
myMail.Subject = "邮件确认";
myMail.BodyFormat = MailFormat.Text;
myMail.Body = "内容"；
myMail.Fields.Add("http://schemas.microsoft.com/cdo/configuration/smtpauthenticate", "1");myMail.Fields.Add("http://schemas.microsoft.com/cdo/configuration/sendusername", EMAIL_ADDRESS);myMail.Fields.Add("http://schemas.microsoft.com/cdo/configuration/sendpassword", EMAIL_PASSWORD);
SmtpMail.SmtpServer = EMAIL_SERVER;
SmtpMail.Send(myMail);

谢谢楼上的，不过我还是想要2.0的请问需不需要设置自己的STMP服务器啊，因为我从网上找到的代码，测试都不通过，现在又出错了，提示：邮箱不可用。服务器响应为: ÓÃ»§±»Ëø¶¨

/// <summary>
        /// 发送邮件
        /// </summary>
        /// <param name="sMailServer"></param>
        /// <param name="sMailServerUserName"></param>
        /// <param name="sMailServerUserPassword"></param>
        /// <param name="sFrom"></param>
        /// <param name="sTo"></param>
        /// <param name="sCc"></param>
        /// <param name="sSubject"></param>
        /// <param name="sBody"></param>
        /// <param name="isBodyHtml"></param>
        /// <param name="mailPriority"></param>
        /// <returns></returns>
        public static ReturnValue SendEmail(string sMailServer,string sMailServerUserName,string sMailServerUserPassword,string sFrom, string sTo, string sCc, string sSubject, string sBody,bool isBodyHtml,System.Net.Mail.MailPriority mailPriority)
        {
            ReturnValue retValue = new ReturnValue();            if (sMailServer == "")
            {
                retValue.HasError = true;
                retValue.Message = "系统没有配置发送邮件的服务器名称！";
                return retValue;
            }
            if (sFrom == "")
            {
                retValue.HasError = true;
                retValue.Message = "系统没有配置发送邮件的帐号！";
                return retValue;
            }            string sBodyEncoding;            sBodyEncoding = Encoding.Default.EncodingName;

            MailMessage MyMail = new MailMessage(sFrom,sTo);
            MyMail.Subject = sSubject;
            MyMail.Body = sBody;
            //MyMail.CC = sCc;            // if (sBodyEncoding== Encoding.UTF7.EncodingName)
            // MyMail.BodyEncoding = Encoding.UTF7;
            // else if (sBodyEncoding== Encoding.UTF8.EncodingName)
            // MyMail.BodyEncoding = Encoding.UTF8;
            // else
            // MyMail.BodyEncoding = Encoding.ASCII;            MyMail.IsBodyHtml = isBodyHtml;

            MyMail.Priority = mailPriority;            try
            {
                SmtpClient smtpClient=new SmtpClient();
                smtpClient.Credentials = new System.Net.NetworkCredential(sMailServerUserName, sMailServerUserPassword);
                smtpClient.Host=sMailServer;
                if (SmtpServerPort > 0) smtpClient.Port = SmtpServerPort;
                smtpClient.Send(MyMail);
            }
            catch (Exception ee)
            {
                retValue.HasError = true;
                retValue.Message = "发送邮件不成功，可能是因为邮件目标地址不存在！详细错误信息是：" + ee.Message;
            }
            return retValue;
        }
    }

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.Net.Mail;
using System.Net;public partial class sendmail : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {    }
    protected void Button1_Click(object sender, EventArgs e)
    {

        string s_from = "[email protected]";
        string s_to = "TextBox1.Text";
        string pwd = TextBox2.Text;        int i = s_from.IndexOf("@");
        string username = s_from.Substring(0, i);        MailAddress from = new MailAddress(s_from);
        MailAddress to = new MailAddress(s_to);
        MailMessage mailobj = new MailMessage(from, to);
        mailobj.Subject = "aaa";
        mailobj.Body = "aaa";
        mailobj.IsBodyHtml = true;
        mailobj.BodyEncoding = System.Text.Encoding.GetEncoding("GB2312");
        mailobj.Priority = MailPriority.High;

        SmtpClient smtp = new SmtpClient("smtp.163.com");
        smtp.UseDefaultCredentials = false;
        smtp.Credentials = new NetworkCredential(username, pwd);
        smtp.DeliveryMethod = SmtpDeliveryMethod.Network;        try
        {
            smtp.Send(mailobj);
            Response.Write("ok!");        }
        catch
        {
            Response.Write("sorry!");
        }    }}

楼上的你有没有测试过啊我怎么不可以啊，还是这个错：【邮箱不可用。服务器响应为: ÓÃ»§±»Ëø¶】

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