比较顺利。。。

1 using System; 2 using System.Collections.Generic; 3 using System.ComponentModel; 4 using System.Data; 5 using System.Drawing; 6 using System.Linq; 7 using System.Text; 8 using System.Threading.Tasks; 9 using System.Windows.Forms;10 using System.Net.Mail;11 12 namespace WindowsFormsApplication213 {14     public partial class Form1 : Form15     {16         public Form1()17         {18             InitializeComponent();19         }20 21         private void button1_Click(object sender, EventArgs e)22         {23             string file = "E:\\bar.txt";24             MailAddress from = new MailAddress("aguncn@163.com");25             MailAddress to = new MailAddress(textBox2.Text);26             MailMessage message = new MailMessage(from, to);27             message.Subject = textBox1.Text;28             message.Body = richTextBox1.Text;29             Attachment myAttachment = new Attachment(file, System.Net.Mime.MediaTypeNames.Application.Octet);30             System.Net.Mime.ContentDisposition disposition = myAttachment.ContentDisposition;31             disposition.CreationDate = System.IO.File.GetCreationTime(file);32             disposition.ModificationDate = System.IO.File.GetLastWriteTime(file);33             disposition.ReadDate = System.IO.File.GetLastAccessTime(file);34             message.Attachments.Add(myAttachment);35             SmtpClient client = new SmtpClient("smtp.163.com", 25);36             client.Credentials = new System.Net.NetworkCredential("aguncn@163.com", "********");37             client.Send(message);38             MessageBox.Show("发送成功");39 40         }41     }42 }