public static string SendMail(string to, string toname, string body, int vbid)
        {
            string responseMsg = string.Empty;
            try
            {
                DataTable dtBasic = new DataTable();

                DBHelper.fnInsert.Read_VoteBasic(vbid, out dtBasic);
                string mSubject = "请注意查看投票信息";

                MailMessage m = new MailMessage();
                m.From = new MailAddress("201103haozheng@edu2act.org", "投票通知");
                m.To.Add(new MailAddress(to, toname));
                if (dtBasic != null && dtBasic.Rows.Count.Equals(1))
                {
                    mSubject = "关于 “" + dtBasic.Rows[0]["VTitle"] + "” 的投票信息";
                    body = "\r\n \r\n 信息简介：\r\n " + dtBasic.Rows[0]["VContent"] + "\r\n \r\n 截止日期：" + ((DateTime)dtBasic.Rows[0]["VDeadline"]).ToString("yyyy-MM-dd hh:mm") + " \r\n \r\n " + body;
                }
                m.Subject = mSubject;
                m.Body = body;

                SmtpClient client = new SmtpClient("email.edu2act.org");
                client.Send(m);
                responseMsg = "success";
            }
            catch (Exception ex)
            {
                responseMsg = "faild-" + ex.Message + ex.StackTrace;
                //throw;
            }
            return responseMsg;
        }