使用System.Net.Mail发送邮件

using System;
using System.Net.Mail;
using System.Net.Mime;
using System.Net;
using System.Collections;
namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            try
            {
                string file = "attach.txt";
                MailMessage message = new MailMessage("**@126.com", "**@mail2.sysu.edu.cn", "Hello", "Hello");
                Attachment data = new Attachment(file, MediaTypeNames.Application.Octet);
                ContentDisposition disposition = data.ContentDisposition;
                disposition.CreationDate = System.IO.File.GetCreationTime(file);
                disposition.ModificationDate = System.IO.File.GetLastWriteTime(file);
                disposition.ReadDate = System.IO.File.GetLastAccessTime(file);
                message.Attachments.Add(data);
                SmtpClient client = new SmtpClient("smtp.126.com");
                client.Credentials = new NetworkCredential("**@126.com","**");
                client.Send(message);
                ContentDisposition cd = data.ContentDisposition;
                Console.WriteLine("Content disposition");
                Console.WriteLine(cd.ToString());
                Console.WriteLine("File {0}", cd.FileName);
                Console.WriteLine("Size {0}", cd.Size);
                Console.WriteLine("Creation {0}", cd.CreationDate);
                Console.WriteLine("Modification {0}", cd.ModificationDate);
                Console.WriteLine("Read {0}", cd.ReadDate);
                Console.WriteLine("Inline {0}", cd.Inline);
                Console.WriteLine("Parameters: {0}", cd.Parameters.Count);
                foreach (DictionaryEntry d in cd.Parameters)
                {
                    Console.WriteLine("{0} = {1}", d.Key, d.Value);
                }
                data.Dispose();
            }
            catch (Exception e)
            {
                Console.WriteLine(e.Message);
            }
        }
    }
}