C# 發郵件類可發送附件

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Net.Mail;

namespace Ajax.發郵件
{
    public class GetMail
    {
         //MailAddress ds = new MailAddress("[e-mail]");
         //   Send(ds, "[e-mail]", "郵件主題", "郵件內容","附件名稱");
        public GetMail()
        { }
             /// <summary>
        /// 發送電子郵件
        /// </summary>
        /// <param name="MessageFrom">發件人郵箱地址</param>
        /// <param name="MessageTo">收件人郵箱地址</param>
        /// <param name="MessageSubject">郵件主題</param>
        /// <param name="MessageBody">郵件內容</param>
        /// <param name="SUpFile">附件</param>
        /// <returns></returns>
        public bool Send(MailAddress MessageFrom, string MessageTo, string MessageSubject, string MessageBody, 

string SUpFile)
        {
            MailMessage message = new MailMessage();
            message.From = MessageFrom;
            message.To.Add(MessageTo); //收件人郵箱地址可以是多個以實現群發

            message.Subject = MessageSubject;
            message.Body = MessageBody;

            if (SUpFile != "")
            {
               
                SUpFile = Server.MapPath("~/發郵件/Upfile/" + SUpFile);//獲得附件在本地地址
                //將文件進行轉換成Attachments
                Attachment data = new Attachment(SUpFile, MediaTypeNames.Application.Octet);
                // Add time stamp information for the file.
                ContentDisposition disposition = data.ContentDisposition;
                disposition.CreationDate = System.IO.File.GetCreationTime(SUpFile);
                disposition.ModificationDate = System.IO.File.GetLastWriteTime(SUpFile);
                disposition.ReadDate = System.IO.File.GetLastAccessTime(SUpFile);

                message.Attachments.Add(data);
                System.Net.Mime.ContentType  ctype=new System.Net.Mime.ContentType (); 
            }

            message.IsBodyHtml = true; //是否為html格式
            message.Priority = MailPriority.Normal; //發送郵件的優先等級
            SmtpClient sc = new SmtpClient();
            sc.Host = "smtp.qq.com"; //指定發送郵件的服務器地址或IP
            sc.Port = 25; //指定發送郵件端口
            sc.Credentials = new System.Net.NetworkCredential("發送郵箱賬號", "賬號密碼"); //指定登錄服務器的try
            {
                sc.Send(message); //發送郵件
            }
            catch
            {
                return false;
            }
            return true;
        }
    }
}