asp.net发送邮件代码
 
 #region 发送邮件
                //创建邮件信息
                objMailMessage = new MailMessage();
                  //objMailMessage.From = "zhangandfang6862@sina.com";//源邮件地址
                objMailMessage.From = strStrmail_Addresser;
                  //objMailMessage.To = "450627136@qq.com";//目的邮件地址
                objMailMessage.From = strEail_Accepy;
                  objMailMessage.Subject = txt_lilte.Text;
                  objMailMessage.Body = txt_content.Text;//发送邮件的内容
                for (int i = 0; i < listBoxControl1.Items.Count; i++)
                  {
                    listVlues = listBoxControl1.Items[i].ToString();
                    //创建一个对象
                    objMailAttachment = new MailAttachment(listVlues);//发送邮件的附件
                    objMailMessage.Attachments.Add(objMailAttachment);
                    //创建文件对象
                    System.IO.FileInfo fi = new FileInfo(@listVlues);
                    strListValues += fi.Name + ";";//文件名
                    //strListValues += listBoxControl1.Items[i].ToString() + ";";
                }
                objMailMessage.Fields.Add "http://schemas.microsoft.com/cdo/configuration/smtpauthenticate", "1");//基本权限
                //objMailMessage.Fields.Add("http://schemas.microsoft.com/cdo/configuration/sendusername", "zhangandfang6862");//用户名
                objMailMessage.Fields.Add("http://schemas.microsoft.com/cdo/configuration/sendusername", UserName);
                //objMailMessage.Fields.Add("http://schemas.microsoft.com/cdo/configuration/sendpassword", "zhang6862.");
                objMailMessage.Fields.Add("http://schemas.microsoft.com/cdo/configuration/sendpassword", UserPwd);
                //SMTP地址
                 //SmtpMail.SmtpServer = "smtp.sina.com.cn";
                SmtpMail.SmtpServer = strSMTP;
                //开始发送邮件
                 SmtpMail.Send(objMailMessage);
                #endregion