DAL:   //保存选项
        public int SavaChoiceid(ResultInfo resultinfo)
        {
            int savaid = 0;
            SqlConnection conn = voteconnManger.ReconnectionStrings();
            try
            {
                conn.Open();
                using (SqlCommand cmd = new SqlCommand("insert into T_Result values('" + resultinfo.choiceid + "')", conn))
                {
                    savaid = (int)cmd.ExecuteNonQuery();
                }
            }
            catch (SqlException se)
            {
                throw se;
            }
            finally
            {
                if (conn.State != System.Data.ConnectionState.Closed)
                {
                    conn.Close();
                    conn.Dispose();
                }
            }
            return savaid;
        }
BLL:    //保存选项
        public int SavaChoiceid(ResultInfo resultinfo)
        {
            return new VoteDAL.ResultDAL().SavaChoiceid(resultinfo);
        }
//保存数据
        protected void btnSavachoiceItem_Click(object sender, EventArgs e)
        {
            string voteresult = "";
            string strTemp = "";
            for (int i = 0; i < this.gvchoiceitem.Rows.Count ; i++)
            {
                strTemp = getselbygrid(gvchoiceitem.Rows[i].FindControl("rdosub") as RadioButtonList);
                if (strTemp == "")
                {
                    Response.Write("<script>alert('每个投票项目必须选择一票,请重试!')</script>");
                    break;
                }
                voteresult = voteresult + strTemp + ",";
            }
            voteresult = voteresult.Substring(0,voteresult.Length-1);
            //string[] splits = new string[voteresult.Length];
            //for (int i = 0; i < voteresult.Length; i++)
            //{
            //    splits[i] = voteresult.Substring(i, 1);
            //}
            ResultInfo result = new ResultInfo();
            result.choiceid = Convert.ToInt32(voteresult);
            int j = new VoteBLL.ResultBLL().SavaChoiceid(result);
            if (j > 0)
            {
                Response.Write("<script>alert('您的投票已经成功保存,感谢您的参与！')</script>");
            }
            else
            {
                Response.Write("<script>alert('您的投票失败,请核实！')</script>");
            }
  result.choiceid = Convert.ToInt32(voteresult);
这句有问题  voteresult是一个string集，里面有“1,4,7”这样的数据  如何转换成int 型上传到数据库里呢？