jmail收信中文乱码

public string POP3mail()

        {

           

          POP3Class popMail = new POP3Class();

          Message mailMessage = new Message();



          string txtSubject = "";

          popMail.Connect("1234","5678","mail.asdfds.com", 110);

                    if (popMail.Count > 0)

          {

              for (int i = 1; i <= popMail.Count; i++)

              {

                  mailMessage = popMail.Messages[i];

                  mailMessage.Charset = "GB2312 " ;

                  mailMessage.ContentTransferEncoding = "base64 ";

　　　　　

　　　　　　　　　mailMessage.ISOEncodeHeaders = false;





            txtSubject += mailMessage.Subject.ToString().Trim() + ",";



              }

          }



          return txtSubject;

        }