StringBuilder sqlmax = new StringBuilder();



                sqlmax.Append("select * from cbdl ");



                sqlmax.Append(sqlcondition);



                SqlParameter[] para2 = new SqlParameter[]{



                    new SqlParameter("@IDdateStart",da1.Value),



                    new SqlParameter("@IDdateEnd",da2.Value),



                };

                DataSet dsmax = helper.GetDataset(sqlmax.ToString(), para2);



                resvalue.Append("<div class='tt_tr' tilte='最大值'>");



                resvalue.Append("<div class='iddate'>" + "最大值" + "</div>");

                //循环各列并赋值

                if (dsmax != null && dsmax.Tables[0].Rows.Count > 0)

                {

                    for (int i = 3; i < dsmax.Tables[0].Columns.Count; i++)

                    {

                        double Maxnum;

                        //DataRow row = dsmax.Tables[0].Rows[i];

                        if (dsmax.Tables[0].Rows[0][i] == DBNull.Value)

                        {