如何发送内嵌图片的E-mail (Inline Attachment)

using System;
using System.Collections.Generic;
using System.Text;
using System.Net.Mail;

namespace SystemNetMailTest
{
   class Program
   {
      static void Main(string[] args)
      {
         string myMailEncoding = "utf-8";

         string myFromEmail = "testtest.com";
         string myFromName = "測試寄件者";

         string myToEmail = "testtest.com";
         string myToName = "測試收件者";

         MailAddress from = 
            new MailAddress(myFromEmail, myFromName, 
                Encoding.GetEncoding(myMailEncoding));
         MailAddress to = 
            new MailAddress(myToEmail, myToName, 
                Encoding.GetEncoding(myMailEncoding));

         MailMessage myMessage = new MailMessage(from, to);

         myMessage.Subject = "郵件主旨";
         myMessage.SubjectEncoding = Encoding.GetEncoding(myMailEncoding);

         myMessage.Body = "<h1>這是郵件內容</h1><hr/><img src=\"Logo.gif\" />";
         myMessage.BodyEncoding = Encoding.GetEncoding(myMailEncoding);

         myMessage.IsBodyHtml = true;

         myMessage.Priority = MailPriority.High;

         // 設定附件檔案(Attachment)

         string strFilePath = @"C:\Logo.gif";

         System.Net.Mail.Attachment attachment1 =
            new System.Net.Mail.Attachment(strFilePath);
         attachment1.Name = System.IO.Path.GetFileName(strFilePath);
         attachment1.NameEncoding = Encoding.GetEncoding(myMailEncoding);
         attachment1.TransferEncoding = System.Net.Mime.TransferEncoding.Base64;

         // 設定該附件為一個內嵌附件(Inline Attachment)
         attachment1.ContentDisposition.Inline = true;
         attachment1.ContentDisposition.DispositionType =
            System.Net.Mime.DispositionTypeNames.Inline;

         myMessage.Attachments.Add(attachment1);

         SmtpClient smtp = new SmtpClient("localhost");

         try
         {
             smtp.Send(myMessage);
             Console.WriteLine(DateTime.Now.ToString() + " 寄信成功");
         }
         catch
         {
             Console.WriteLine(DateTime.Now.ToString() + " 寄信失敗!!!");
         }

         Console.ReadKey();
     }
  }
}