【转】c# 发送email，正文支持html格式，包含附件

转自：http://www.cnblogs.com/phcis/archive/2010/03/02/1676577.html
string v_smtpAddress ="smtp.xxx.com";//smtp地址，如smtp.163.com
string v_sendMailUserName = "userName";//发送邮件使用的用户名
string v_sendMailPassword = "userPwd";//发送邮件使用的密码
string v_sendMailAddress ="phcis@163.com";//发送邮件的mail地址
string v_receiveMailAddress ="phcis@163.com";//接收邮件的mail地址
string v_mailSubject = "邮件主题";//邮件主题
SmtpClient smtp = new SmtpClient(v_smtpAddress);
smtp.Credentials = new System.Net.NetworkCredential(v_sendMailUserName, v_sendMailPassword);
MailMessage mes = new MailMessage();
mes.From = new MailAddress(v_sendMailAddress);
mes.To.Add(v_receiveMailAddress);
 
mes.Subject = v_mailSubject;
mes.Body = TextArea1.Value;
mes.IsBodyHtml = true;//使用是否html格式
//增加附件
System.Net.Mail.Attachment mailAttach_1 = new  Attachment(@"d:\b.txt");
mes.Attachments.Add(mailAttach_1);
         
smtp.Send(mes);
mailAttach_1.Dispose();//释放由附件占用的资源